diff --git a/AGENTS.md b/AGENTS.md
index c67bf4193..482ef2b9e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -8,23 +8,24 @@ This repo contains multiple packages, but **`packages/coding-agent/`** is the pr
 
 ### Package Structure
 
-| Package                 | Description                                          |
-| ----------------------- | ---------------------------------------------------- |
-| `packages/ai`           | Multi-provider LLM client with streaming support     |
+| Package                 | Description                                                                             |
+| ----------------------- | --------------------------------------------------------------------------------------- |
+| `packages/ai`           | Multi-provider LLM client with streaming support                                        |
 | `packages/catalog`      | Model catalog: bundled models.json, provider descriptors, model identity/classification |
-| `packages/agent`        | Agent runtime with tool calling and state management |
-| `packages/coding-agent` | Main CLI application (primary focus)                 |
-| `packages/tui`          | Terminal UI library with differential rendering      |
-| `packages/natives`      | Bindings for native text/image/grep operations       |
-| `packages/stats`        | Local observability dashboard (`omp stats`)          |
-| `packages/utils`        | Shared utilities (logger, streams, temp files)       |
-| `crates/pi-natives`     | Rust crate for performance-critical text/grep ops    |
+| `packages/agent`        | Agent runtime with tool calling and state management                                    |
+| `packages/coding-agent` | Main CLI application (primary focus)                                                    |
+| `packages/tui`          | Terminal UI library with differential rendering                                         |
+| `packages/natives`      | Bindings for native text/image/grep operations                                          |
+| `packages/stats`        | Local observability dashboard (`omp stats`)                                             |
+| `packages/utils`        | Shared utilities (logger, streams, temp files)                                          |
+| `crates/pi-natives`     | Rust crate for performance-critical text/grep ops                                       |
 
-**Catalog import convention**: code in this repo imports catalog *values* (bundled models, model-thinking helpers, identity, descriptors, model manager/cache) from `@oh-my-pi/pi-catalog/<module>` — never via `@oh-my-pi/pi-ai`. The pi-ai barrel re-exports only the model/effort *types* its own signatures use (`Model`, `Api`, `ThinkingConfig`, `Effort`, …); type-only imports of those from `@oh-my-pi/pi-ai` are fine.
+**Catalog import convention**: code in this repo imports catalog _values_ (bundled models, model-thinking helpers, identity, descriptors, model manager/cache) from `@oh-my-pi/pi-catalog/<module>` — never via `@oh-my-pi/pi-ai`. The pi-ai barrel re-exports only the model/effort _types_ its own signatures use (`Model`, `Api`, `ThinkingConfig`, `Effort`, …); type-only imports of those from `@oh-my-pi/pi-ai` are fine.
 
 ## GitHub
 
 Unless user tells you exactly what to write:
+
 - **Never comment on GitHub** (issues, PRs, discussions).
 - **Never create issues on GitHub**.
 
@@ -64,20 +65,20 @@ Use Bun APIs where they provide a cleaner alternative; fall back to `node:*` onl
 
 ### Quick reference
 
-| Operation       | Use                                       | Not                             |
-| --------------- | ----------------------------------------- | ------------------------------- |
-| File read/write | `Bun.file()`, `Bun.write()`               | `readFileSync`, `writeFileSync` |
-| Spawn process   | `` $`cmd` ``, `Bun.spawn()`               | `child_process`                 |
-| Sleep           | `Bun.sleep(ms)`                           | `setTimeout` promise            |
-| Binary lookup   | `$which("git")` from `@oh-my-pi/pi-utils` | `spawnSync(["which", "git"])`   |
-| HTTP server     | `Bun.serve()`                             | `http.createServer()`           |
-| SQLite          | `bun:sqlite`                              | `better-sqlite3`                |
-| Hashing         | `Bun.hash()`, `Bun.password.*`, WebCrypto | `node:crypto`                   |
-| Path resolution | `import.meta.dir`, `import.meta.path`     | `fileURLToPath` dance           |
-| JSON5           | `Bun.JSON5.parse()` / `.stringify()`      | `json5` package                 |
+| Operation       | Use                                       | Not                                |
+| --------------- | ----------------------------------------- | ---------------------------------- |
+| File read/write | `Bun.file()`, `Bun.write()`               | `readFileSync`, `writeFileSync`    |
+| Spawn process   | `` $`cmd` ``, `Bun.spawn()`               | `child_process`                    |
+| Sleep           | `Bun.sleep(ms)`                           | `setTimeout` promise               |
+| Binary lookup   | `$which("git")` from `@oh-my-pi/pi-utils` | `spawnSync(["which", "git"])`      |
+| HTTP server     | `Bun.serve()`                             | `http.createServer()`              |
+| SQLite          | `bun:sqlite`                              | `better-sqlite3`                   |
+| Hashing         | `Bun.hash()`, `Bun.password.*`, WebCrypto | `node:crypto`                      |
+| Path resolution | `import.meta.dir`, `import.meta.path`     | `fileURLToPath` dance              |
+| JSON5           | `Bun.JSON5.parse()` / `.stringify()`      | `json5` package                    |
 | JSONL           | `Bun.JSONL.parse()` / `.parseChunk()`     | `text.split("\n").map(JSON.parse)` |
-| String width    | `Bun.stringWidth()`                       | `get-east-asian-width`, custom  |
-| Text wrapping   | `Bun.wrapAnsi()`                          | custom ANSI-aware wrappers      |
+| String width    | `Bun.stringWidth()`                       | `get-east-asian-width`, custom     |
+| Text wrapping   | `Bun.wrapAnsi()`                          | custom ANSI-aware wrappers         |
 
 ### Process execution
 
@@ -99,6 +100,7 @@ Methods: `.quiet()`, `.nothrow()`, `.text()`, `.cwd(path)`.
 Use `Bun.spawn`/`Bun.spawnSync` only for: long-running processes (LSP, kernels), streaming stdin/stdout/stderr (SSE, JSON-RPC), or process control (signals, kill, complex lifecycle).
 
 When using `pipe` mode, cast the stream:
+
 ```typescript
 const child = Bun.spawn(["cmd"], { stdout: "pipe", stderr: "pipe" });
 const reader = (child.stdout as ReadableStream<Uint8Array>).getReader();
@@ -120,6 +122,7 @@ import * as os from "node:os";
 ### File I/O
 
 Prefer Bun:
+
 ```typescript
 const text = await Bun.file(path).text();
 const data = await Bun.file(path).json();
@@ -129,6 +132,7 @@ await Bun.write(path, data); // auto-creates parent dirs
 Use `node:fs/promises` for directory ops (`fs.mkdir`, `fs.rm`, `fs.readdir`) — Bun has no native directory APIs. Avoid sync APIs in async flows; use sync only when forced by a synchronous interface.
 
 **Anti-patterns:**
+
 - `existsSync`/`readFileSync`/`writeFileSync` in async code → `Bun.file()` APIs.
 - `mkdir(dirname(path), …)` before `Bun.write(path, …)` → redundant; `Bun.write` handles it.
 - `if (await file.exists()) { await file.json() }` → two syscalls plus race. Use try-catch with `isEnoent`:
@@ -148,11 +152,15 @@ Use `node:fs/promises` for directory ops (`fs.mkdir`, `fs.rm`, `fs.readdir`) —
 ### Streams
 
 Prefer centralized helpers:
+
 ```typescript
 import { readStream, readLines } from "./utils/stream";
 const text = await readStream(child.stdout);
-for await (const line of readLines(stream)) { /* ... */ }
+for await (const line of readLines(stream)) {
+	/* ... */
+}
 ```
+
 Manual reader loops only when the protocol requires it (SSE, streaming JSON-RPC).
 
 ### Misc
@@ -164,9 +172,10 @@ Manual reader loops only when the protocol requires it (SSE, streaming JSON-RPC)
 
 ## Generated Files
 
-**NEVER edit `packages/catalog/src/models.json` directly.** It is generated from upstream sources (models.dev, provider catalog discovery, OpenCode docs) by `packages/catalog/scripts/generate-models.ts` and the descriptors/resolvers in `packages/catalog/src/provider-models/`. Hand-edits get overwritten on the next regen.
+**NEVER edit `packages/catalog/src/models.json` directly.** It is generated from upstream sources (stencil.so, provider catalog discovery, OpenCode docs) by `packages/catalog/scripts/generate-models.ts` and the descriptors/resolvers in `packages/catalog/src/provider-models/`. Hand-edits get overwritten on the next regen.
 
 To change an entry, fix the source:
+
 - **Resolution rules / per-id overrides** → relevant resolver in `packages/catalog/src/provider-models/openai-compat.ts` (e.g. `createOpenCodeApiResolution`'s id-override map).
 - **Provider catalog entries** (default model, discovery factory/flags) → the `CATALOG_PROVIDERS` table in `packages/catalog/src/provider-models/descriptors.ts`.
 - **Generator-level fixups** (premium multipliers, codex pricing fallback, fallback models, post-processing) → `packages/catalog/scripts/generate-models.ts`.
@@ -193,12 +202,14 @@ Logs go to `~/.omp/logs/omp.YYYY-MM-DD.log` with automatic rotation. Standalone
 All text displayed in tool renderers must be sanitized. Raw content (file contents, error messages, tool output) breaks terminal rendering: tabs → visual holes, long lines → overflow, paths → leak home directory.
 
 **Rules:**
+
 - **Tabs → spaces** via `replaceTabs()` (from `@oh-my-pi/pi-tui` or `../tools/render-utils`).
 - **Truncate** lines with `truncateToWidth()` / `ui.truncate()`. Use `TRUNCATE_LENGTHS` constants.
 - **Shorten paths** with `shortenPath()` (replaces home with `~`).
 - **Preview limits** from `PREVIEW_LIMITS`. No ad-hoc numbers.
 
 **Apply to every render path**, not just the happy one:
+
 - Success output (file previews, command output, search results).
 - **Error messages** — these often embed file content (e.g., patch failure messages include unmatched lines). If a message contains file content, it needs `replaceTabs()`.
 - Diff content (added and removed).
@@ -209,6 +220,7 @@ All text displayed in tool renderers must be sanitized. Raw content (file conten
 Tool-call previews can have **multiple render paths**. If you add preview-only fields or depend on partially streamed args, update every path — not only the final renderer. Streamed argument buffers decode into display args via `decodeStreamedToolArgs` / `ToolArgsRevealController` (`modes/controllers/tool-args-reveal.ts`); both the live event path and transcript rebuilds must go through them — never spread provider-parsed `arguments` next to a raw `__partialJson` (parsed args lag the stream by a throttled parse window).
 
 For the bash tool specifically:
+
 - The pending preview may need raw `partialJson`, not just parsed `arguments`. Parsed args lag until a JSON object closes, which makes inline env assignments appear only at the end.
 - Preserve preview-only fields (e.g. `__partialJson`) through `event-controller.ts`, transcript rebuilds in `ui-helpers.ts`, and merged call/result rendering in `tool-execution.ts`. Missing one path causes inconsistent previews.
 - `ToolExecutionComponent.#buildRenderContext()` for bash must work even before a result exists — the renderer uses call args plus render context to show the command preview while streaming.
@@ -235,7 +247,7 @@ Test the contract the system exposes — not the easiest internal detail to asse
 - Smoke tests are acceptable only when they catch a failure mode narrower tests would miss. "Package boots" or "command starts" alone is not enough.
 - Assert exact strings, ordering, and formatting only when downstream code parses or depends on the exact bytes. Otherwise assert semantic content.
 - Compile-time guarantees → type checks/type tests, not runtime placeholders.
-- **Never source-grep.** A test that reads an implementation file (`.ts`/`.rs`/build script) and asserts on its *text* — `expect(src).toContain("someCall()")`, `.toMatch(/import .../)`, `.not.toContain("oldName")`, or "comment must say X" — is banned. It tests how code *looks*, not what it *does*: it breaks on harmless refactors (comment reflow, rename, import reorder) and passes while the behavior is broken. Assert the observable contract instead (run the code, check output/state/error), use the runtime smoke probe for wiring you cannot exercise in-process, and enforce structural invariants (no value-import of X, no self-import) with a type test or a lint/biome rule — never a string scan of the source. (Reading a file your code *wrote* — apply-patch result, generated bundle, temp fixture — and asserting on that output is fine; that is behavior, not a source grep.)
+- **Never source-grep.** A test that reads an implementation file (`.ts`/`.rs`/build script) and asserts on its _text_ — `expect(src).toContain("someCall()")`, `.toMatch(/import .../)`, `.not.toContain("oldName")`, or "comment must say X" — is banned. It tests how code _looks_, not what it _does_: it breaks on harmless refactors (comment reflow, rename, import reorder) and passes while the behavior is broken. Assert the observable contract instead (run the code, check output/state/error), use the runtime smoke probe for wiring you cannot exercise in-process, and enforce structural invariants (no value-import of X, no self-import) with a type test or a lint/biome rule — never a string scan of the source. (Reading a file your code _wrote_ — apply-patch result, generated bundle, temp fixture — and asserting on that output is fine; that is behavior, not a source grep.)
 - Don't add tests for tiny low-risk changes unless they protect a real contract or fix a regression-prone edge case.
 - Prefer focused package-local verification for the changed area.
 
@@ -244,6 +256,7 @@ Test the contract the system exposes — not the easiest internal detail to asse
 Location: `packages/*/CHANGELOG.md` (per package).
 
 **Format** — sections under `## [Unreleased]`:
+
 - `### Breaking Changes` (first if present)
 - `### Added`
 - `### Changed`
@@ -251,11 +264,13 @@ Location: `packages/*/CHANGELOG.md` (per package).
 - `### Removed`
 
 **Rules:**
+
 - New entries always go under `## [Unreleased]`.
 - Never modify already-released sections (e.g., `## [0.12.2]`) — they are immutable.
 - Don't flag changelog section order or formatting in reviews or PRs — `bun run release` runs `fix-changelogs` which normalizes everything automatically.
 
 **Attribution:**
+
 - Internal (from issues): `Fixed foo bar ([#123](https://github.com/can1357/oh-my-pi/issues/123))`.
 - External contributions: `Added feature X ([#456](https://github.com/can1357/oh-my-pi/pull/456) by [@username](https://github.com/username))`.
 
diff --git a/packages/catalog/README.md b/packages/catalog/README.md
index 93477f3e9..3196a1ca0 100644
--- a/packages/catalog/README.md
+++ b/packages/catalog/README.md
@@ -4,24 +4,24 @@ Model catalog for [oh-my-pi](https://github.com/can1357/oh-my-pi): bundled model
 
 ## What's inside
 
-| Module | Purpose |
-| --- | --- |
-| `models.json` + `models` | Bundled model database (pricing, context windows, modalities, thinking support) |
-| `provider-models` | Provider catalog descriptors (`CATALOG_PROVIDERS`), per-provider model resolution rules |
-| `discovery` | Runtime model discovery for OpenAI-compatible endpoints, Gemini, Codex, Cursor, Antigravity, Ollama |
-| `identity` | Model id parsing and classification (family/version), reference resolution, equivalence, selection priority |
-| `model-thinking` | Thinking/reasoning metadata and generated per-model policies |
-| `model-manager` / `model-cache` | Runtime model registry with discovery refresh and on-disk caching |
-| `variant-collapse` | Collapsing provider-specific variants of the same underlying model |
-| `compat` | Request/response compatibility fixups for OpenAI- and Anthropic-shaped APIs |
-| `wire` | Wire-level helpers: Codex, Gemini headers, GitHub Copilot |
-| `effort` | Reasoning-effort level definitions |
+| Module                          | Purpose                                                                                                     |
+| ------------------------------- | ----------------------------------------------------------------------------------------------------------- |
+| `models.json` + `models`        | Bundled model database (pricing, context windows, modalities, thinking support)                             |
+| `provider-models`               | Provider catalog descriptors (`CATALOG_PROVIDERS`), per-provider model resolution rules                     |
+| `discovery`                     | Runtime model discovery for OpenAI-compatible endpoints, Gemini, Codex, Cursor, Antigravity, Ollama         |
+| `identity`                      | Model id parsing and classification (family/version), reference resolution, equivalence, selection priority |
+| `model-thinking`                | Thinking/reasoning metadata and generated per-model policies                                                |
+| `model-manager` / `model-cache` | Runtime model registry with discovery refresh and on-disk caching                                           |
+| `variant-collapse`              | Collapsing provider-specific variants of the same underlying model                                          |
+| `compat`                        | Request/response compatibility fixups for OpenAI- and Anthropic-shaped APIs                                 |
+| `wire`                          | Wire-level helpers: Codex, Gemini headers, GitHub Copilot                                                   |
+| `effort`                        | Reasoning-effort level definitions                                                                          |
 
 Import from subpaths (`@oh-my-pi/pi-catalog/<module>`) or the root barrel.
 
 ## models.json is generated
 
-Never edit `src/models.json` by hand — it is produced from upstream sources (models.dev, provider catalog discovery, OpenCode docs) by `scripts/generate-models.ts` and the resolvers in `src/provider-models/`. Regenerate with:
+Never edit `src/models.json` by hand — it is produced from upstream sources (stencil.so, provider catalog discovery, OpenCode docs) by `scripts/generate-models.ts` and the resolvers in `src/provider-models/`. Regenerate with:
 
 ```sh
 bun run gen:models
diff --git a/packages/catalog/scripts/generate-models.ts b/packages/catalog/scripts/generate-models.ts
index 55d7378de..a60423732 100644
--- a/packages/catalog/scripts/generate-models.ts
+++ b/packages/catalog/scripts/generate-models.ts
@@ -35,6 +35,7 @@ import {
 	buildXaiOAuthStaticSeed,
 	clampFireworksKimiMaxTokens,
 	clampKimiK27CodeMaxTokens,
+	fetchWellKnownModels,
 	GMI_CLOUD_STATIC_MODELS,
 	isFireworksKimiK2ModelId,
 	isKimiK27CodeModelId,
@@ -154,15 +155,14 @@ async function fetchProviderModelsFromCatalog(
 
 async function loadModelsDevData(): Promise<ModelSpec[]> {
 	try {
-		console.log("Fetching models from models.dev API...");
-		const response = await fetch("https://models.dev/api.json");
-		const data = await response.json();
+		console.log("Fetching stencil.so catalog from catalog.stencil.so...");
+		const data = await fetchWellKnownModels();
 		const models = mapModelsDevToModels(data as Record<string, unknown>, MODELS_DEV_PROVIDER_DESCRIPTORS);
 		models.sort((a, b) => a.id.localeCompare(b.id));
-		console.log(`Loaded ${models.length} tool-capable models from models.dev`);
+		console.log(`Loaded ${models.length} tool-capable models from stencil.so`);
 		return models;
 	} catch (error) {
-		console.error("Failed to load models.dev data:", error);
+		console.error("Failed to load stencil.so data:", error);
 		return [];
 	}
 }
@@ -212,7 +212,7 @@ function applyGlobalModelsDevFallback(
 			name: reference.name,
 			reasoning: reference.reasoning,
 			input: reference.input,
-			// Fill unknown endpoint limits from same-id models.dev references, but keep
+			// Fill unknown endpoint limits from same-id stencil.so references, but keep
 			// provider-specific values when discovery returned them explicitly.
 			contextWindow: model.contextWindow ?? reference.contextWindow,
 			maxTokens: model.maxTokens ?? reference.maxTokens,
@@ -248,7 +248,7 @@ function applyUmansPricingFallback(models: readonly ModelSpec[], modelsDevModels
 	}
 
 	// The public endpoint exposes this technical alias for Umans Flash, but
-	// models.dev publishes pricing only for the recommended `umans-flash` id.
+	// stencil.so publishes pricing only for the recommended `umans-flash` id.
 	const flashCost = paygCosts.get("umans-flash");
 	if (flashCost) {
 		paygCosts.set("umans-qwen3.6-35b-a3b", flashCost);
@@ -502,7 +502,7 @@ async function generateModels() {
 		})),
 	);
 	// A provider is authoritative once its endpoint snapshot can replace the
-	// models.dev / previous-snapshot rows. Requiring fetched models keeps a
+	// stencil.so / previous-snapshot rows. Requiring fetched models keeps a
 	// flaky empty-but-200 discovery from silently wiping another provider's
 	// bundled catalog; only alibaba-token-plan treats an empty success as
 	// authoritative, because its `/models` allowlist reflects the subscribed
@@ -520,8 +520,8 @@ async function generateModels() {
 	const bundledModelsDevModels = modelsDevModels.filter(model => !authoritativeCatalogProviders.has(model.provider));
 	// getGitLabDuoModels returns built models; project back to spec stage for the bundle.
 	const gitLabDuoModels = getGitLabDuoModels().map(model => toModelSpec(model));
-	// Combine models. models.dev has priority unless a provider's successful endpoint
-	// discovery is authoritative; those endpoint snapshots replace models.dev rows.
+	// Combine models. stencil.so has priority unless a provider's successful endpoint
+	// discovery is authoritative; those endpoint snapshots replace stencil.so rows.
 	let allModels = applyGlobalModelsDevFallback(
 		[...bundledModelsDevModels, ...catalogProviderModels, ...gitLabDuoModels],
 		modelsDevModels,
@@ -531,7 +531,7 @@ async function generateModels() {
 		allModels.push(CLOUDFLARE_FALLBACK_MODEL as ModelSpec<"anthropic-messages">);
 	}
 
-	// xai-oauth is not in models.dev; its descriptor's catalogDiscovery fetch
+	// xai-oauth is not in stencil.so; its descriptor's catalogDiscovery fetch
 	// only succeeds with live SuperGrok OAuth credentials (and on success the
 	// dynamic entries — already overlaid by applyXAIOAuthCuration — win dedup
 	// below). Always push the curated seed so a regen without credentials, or
@@ -547,7 +547,7 @@ async function generateModels() {
 		allModels.push(...ALIBABA_TOKEN_PLAN_STATIC_MODELS);
 	}
 	// Seed Anthropic models that are live on the first-party API or in limited
-	// release but that models.dev has not catalogued yet (e.g. Claude Fable 5 /
+	// release but that stencil.so has not catalogued yet (e.g. Claude Fable 5 /
 	// Mythos 5). Deduped behind upstream entries; metadata is pinned in
 	// applyAnthropicCatalogPolicy.
 	allModels.push(...ANTHROPIC_CURATED_FALLBACK_MODELS);
@@ -617,7 +617,7 @@ async function generateModels() {
 	}
 	// Merge previous models.json entries as fallback for provider/model pairs not
 	// fetched dynamically. Providers covered by authoritative endpoint discovery
-	// or authoritative models.dev sources keep that upstream list exactly, so
+	// or authoritative stencil.so sources keep that upstream list exactly, so
 	// retired entries from the previous snapshot do not reappear during regeneration.
 	// Discovery-only providers (local inference servers) — never bundle static models.
 	const fetchedKeys = new Set(allModels.map(model => `${model.provider}/${model.id}`));
diff --git a/packages/catalog/scripts/generated-policies.ts b/packages/catalog/scripts/generated-policies.ts
index 77a0bab37..4e3d0c0fb 100644
--- a/packages/catalog/scripts/generated-policies.ts
+++ b/packages/catalog/scripts/generated-policies.ts
@@ -52,7 +52,7 @@ export const CLOUDFLARE_FALLBACK_MODEL: ModelSpec<"anthropic-messages"> = {
 };
 
 /**
- * `models.dev` currently lists `jp.anthropic.claude-opus-5`, but AWS's own
+ * `stencil.so` currently lists `jp.anthropic.claude-opus-5`, but AWS's own
  * Bedrock model card documents only `anthropic.claude-opus-5` plus the `us.`,
  * `eu.`, `au.`, and `global.` Geo/Global inference-profile IDs under
  * Programmatic Access; Japan regions are marked unsupported for Geo inference
@@ -321,7 +321,7 @@ function applyGeneratedModelPolicy(model: ModelSpec<Api>): void {
 }
 
 function applyAnthropicCatalogPolicy(model: ModelSpec<Api>, parsedModel: AnthropicModel): void {
-	// Claude Opus 4.5: models.dev reports 3x the correct cache pricing.
+	// Claude Opus 4.5: stencil.so reports 3x the correct cache pricing.
 	if (model.provider === "anthropic" && parsedModel.kind === "opus" && semverEqual(parsedModel.version, "4.5")) {
 		model.cost.cacheRead = 0.5;
 		model.cost.cacheWrite = 6.25;
@@ -336,7 +336,7 @@ function applyAnthropicCatalogPolicy(model: ModelSpec<Api>, parsedModel: Anthrop
 	}
 
 	// Claude Fable/Mythos 5: Anthropic's /v1/models omits token limits and
-	// pricing, and models.dev lags new releases. Pin authoritative values from
+	// pricing, and stencil.so lags new releases. Pin authoritative values from
 	// the model card (1M context / 128k output) and pricing docs ($10 in / $50
 	// out per MTok).
 	if (model.provider === "anthropic" && isFableOrMythos(parsedModel.kind)) {
diff --git a/packages/catalog/src/model-manager.ts b/packages/catalog/src/model-manager.ts
index a11fdc0ae..185477c68 100644
--- a/packages/catalog/src/model-manager.ts
+++ b/packages/catalog/src/model-manager.ts
@@ -14,10 +14,10 @@ const NON_AUTHORITATIVE_RETRY_MS = 5 * 60 * 1000;
 export type ModelRefreshStrategy = "online" | "offline" | "online-if-uncached";
 
 /**
- * Hook for loading and mapping models.dev fallback data into canonical model objects.
+ * Hook for loading and mapping stencil.so fallback data into canonical model objects.
  */
 export interface ModelsDevFallback<TApi extends Api = Api, TPayload = unknown> {
-	/** Fetches raw fallback payload (for example from models.dev). */
+	/** Fetches raw fallback payload (for example from stencil.so). */
 	fetch(): Promise<TPayload>;
 	/** Maps payload into provider models. */
 	map(payload: TPayload, providerId: Provider): readonly ModelSpec<TApi>[];
@@ -51,7 +51,7 @@ export interface ModelManagerOptions<TApi extends Api = Api, TModelsDevPayload =
 	restorableHeaderFallback?: Record<string, string>;
 	/** Optional dynamic endpoint fetcher. */
 	fetchDynamicModels?: () => Promise<readonly ModelSpec<TApi>[] | null>;
-	/** Optional models.dev fallback hook. */
+	/** Optional stencil.so fallback hook. */
 	modelsDev?: ModelsDevFallback<TApi, TModelsDevPayload>;
 	/** Clock override for deterministic tests. */
 	now?: () => number;
@@ -171,7 +171,7 @@ function restoreCachedModelHeaders<TApi extends Api>(
 
 /**
  * Resolves provider models with source precedence:
- * static -> models.dev -> cache -> dynamic.
+ * static -> stencil.so -> cache -> dynamic.
  *
  * Later sources override earlier ones by model id.
  */
diff --git a/packages/catalog/src/models.ts b/packages/catalog/src/models.ts
index 7204e6bc2..0c43aa1d6 100644
--- a/packages/catalog/src/models.ts
+++ b/packages/catalog/src/models.ts
@@ -6,7 +6,7 @@ import type { Api, KnownProvider, Model, ModelSpec, Usage } from "./types";
  * Static bundled model registry loaded from `models.json`.
  *
  * This module intentionally exposes compile-time defaults only.
- * It does not include runtime discovery, models.dev overlays, or on-disk cache state.
+ * It does not include runtime discovery, stencil.so overlays, or on-disk cache state.
  *
  * For runtime-aware resolution, use `createModelManager()` / `resolveProviderModels()`.
  */
diff --git a/packages/catalog/src/provider-models/openai-compat.ts b/packages/catalog/src/provider-models/openai-compat.ts
index bf386a71f..04c791c02 100644
--- a/packages/catalog/src/provider-models/openai-compat.ts
+++ b/packages/catalog/src/provider-models/openai-compat.ts
@@ -1,3 +1,4 @@
+import { VERSION } from "@oh-my-pi/pi-utils";
 import * as logger from "@oh-my-pi/pi-utils/logger";
 import {
 	fetchOpenAICompatibleModels,
@@ -31,7 +32,10 @@ import {
 import { createBundledReferenceMap, createReferenceResolver, toModelSpec } from "./bundled-references";
 import { getDefaultModelDiscoveryBaseUrl, resolveModelCacheProviderId } from "./cache-provider-id";
 
-const MODELS_DEV_URL = "https://models.dev/api.json";
+const MODELS_DEV_URL = "https://catalog.stencil.so/models.json.zstd";
+
+/** Little-endian magic number opening every zstd frame (RFC 8878). */
+const ZSTD_MAGIC = 0xfd2fb528;
 
 /**
  * Uses a cancellable timer rather than the native abort-timeout helper so
@@ -93,16 +97,74 @@ function toInputCapabilities(value: unknown): ("text" | "image")[] {
 	return supportsImage ? ["text", "image"] : ["text"];
 }
 
-async function fetchModelsDevPayload(fetchImpl: FetchImpl = discoveryFetch(), signal?: AbortSignal): Promise<unknown> {
-	const response = await fetchImpl(MODELS_DEV_URL, {
-		method: "GET",
-		headers: { Accept: "application/json" },
-		signal,
-	});
-	if (!response.ok) {
-		throw new Error(`models.dev fetch failed: ${response.status}`);
+/**
+ * Process-wide catalog session: the first call downloads the payload (the one
+ * request the server logs); later calls revalidate with `If-None-Match` and
+ * reuse the decoded payload on `304`. Failure after a successful load falls
+ * back to the session copy.
+ */
+const catalogSession: {
+	inflight: Promise<unknown> | null;
+	payload: unknown;
+	etag: string | null;
+	hasPayload: boolean;
+} = { inflight: null, payload: undefined, etag: null, hasPayload: false };
+
+const CATALOG_USER_AGENT = `omp/${VERSION} (+https://omp.sh)`;
+
+/**
+ * Fetches the models.dev catalog via catalog.stencil.so, which serves a
+ * field-pruned copy precompressed as a zstd blob (~93 KB vs ~3.3 MB raw).
+ * The frame magic is sniffed rather than trusting content-type so plain-JSON
+ * responses (test stubs, fallback mirrors) parse identically.
+ *
+ * Fetched fully once per process: concurrent callers share the in-flight
+ * request, repeat callers send a conditional GET that the server answers
+ * (and deliberately does not log) with `304`.
+ */
+export function fetchWellKnownModels(fetchImpl?: FetchImpl, signal?: AbortSignal): Promise<unknown> {
+	if (!catalogSession.inflight) {
+		catalogSession.inflight = fetchCatalogPayload(fetchImpl ?? discoveryFetch(), signal).finally(() => {
+			catalogSession.inflight = null;
+		});
 	}
-	return response.json();
+	return catalogSession.inflight;
+}
+
+async function fetchCatalogPayload(fetchImpl: FetchImpl, signal?: AbortSignal): Promise<unknown> {
+	const headers: Record<string, string> = {
+		Accept: "application/zstd, application/json",
+		"User-Agent": CATALOG_USER_AGENT,
+	};
+	if (catalogSession.hasPayload && catalogSession.etag) {
+		headers["If-None-Match"] = catalogSession.etag;
+	}
+	let response: Response;
+	try {
+		response = await fetchImpl(MODELS_DEV_URL, { method: "GET", headers, signal });
+	} catch (error) {
+		if (catalogSession.hasPayload) {
+			return catalogSession.payload;
+		}
+		throw error;
+	}
+	if (response.status === 304 && catalogSession.hasPayload) {
+		return catalogSession.payload;
+	}
+	if (!response.ok) {
+		if (catalogSession.hasPayload) {
+			return catalogSession.payload;
+		}
+		throw new Error(`models catalog fetch failed: ${response.status}`);
+	}
+	const bytes = new Uint8Array(await response.arrayBuffer());
+	const isZstd = bytes.length >= 4 && new DataView(bytes.buffer, bytes.byteOffset).getUint32(0, true) === ZSTD_MAGIC;
+	const text = new TextDecoder().decode(isZstd ? await Bun.zstdDecompress(bytes) : bytes);
+	const payload: unknown = JSON.parse(text);
+	catalogSession.payload = payload;
+	catalogSession.etag = response.headers.get("etag");
+	catalogSession.hasPayload = true;
+	return payload;
 }
 
 function mapAnthropicModelsDev(payload: unknown, baseUrl: string): ModelSpec<"anthropic-messages">[] {
@@ -1566,7 +1628,7 @@ async function loadSiliconFlowModelsDevReferences(
 		// Bounded: this enrichment is optional, so a stalled models.dev must not
 		// hold back the authoritative endpoint request that runs after it.
 		const payload = await withCatalogDiscoveryTimeout(SILICONFLOW_MODELS_DEV_REFERENCE_TIMEOUT_MS, signal =>
-			fetchModelsDevPayload(fetchImpl, signal),
+			fetchWellKnownModels(fetchImpl, signal),
 		);
 		return createModelsDevReferenceMap<"openai-completions">(
 			mapModelsDevToModels(payload as Record<string, unknown>, [descriptor]),
@@ -2024,7 +2086,7 @@ function createModelsDevReferenceMap<TApi extends Api>(
 
 async function loadModelsDevReferences<TApi extends Api>(fetchImpl?: FetchImpl): Promise<Map<string, ModelSpec<TApi>>> {
 	try {
-		const payload = await fetchModelsDevPayload(fetchImpl);
+		const payload = await fetchWellKnownModels(fetchImpl);
 		return createModelsDevReferenceMap<TApi>(
 			mapModelsDevToModels(payload as Record<string, unknown>, MODELS_DEV_PROVIDER_DESCRIPTORS),
 		);
@@ -4842,12 +4904,12 @@ export function anthropicModelManagerOptions(
 	return {
 		providerId: "anthropic",
 		modelsDev: {
-			fetch: () => fetchModelsDevPayload(config?.fetch),
+			fetch: () => fetchWellKnownModels(config?.fetch),
 			map: payload => mapAnthropicModelsDev(payload, baseUrl),
 		},
 		...(apiKey && {
 			fetchDynamicModels: async () => {
-				const modelsDevModels = await fetchModelsDevPayload(config?.fetch)
+				const modelsDevModels = await fetchWellKnownModels(config?.fetch)
 					.then(payload => mapAnthropicModelsDev(payload, baseUrl))
 					.catch(() => []);
 				const references = buildAnthropicReferenceMap(modelsDevModels);
diff --git a/packages/catalog/test/amazon-bedrock-opus-5.test.ts b/packages/catalog/test/amazon-bedrock-opus-5.test.ts
index d91ceddd8..d1e54e6ca 100644
--- a/packages/catalog/test/amazon-bedrock-opus-5.test.ts
+++ b/packages/catalog/test/amazon-bedrock-opus-5.test.ts
@@ -18,8 +18,8 @@ const AWS_DOCUMENTED_OPUS_5_IDS = [
 	"global.anthropic.claude-opus-5",
 ];
 
-// A representative `models.dev` "amazon-bedrock" payload for Claude Opus 5.
-// models.dev lists each inference-profile prefix as its own row (the `eu.`
+// A representative `stencil.so` "amazon-bedrock" payload for Claude Opus 5.
+// stencil.so lists each inference-profile prefix as its own row (the `eu.`
 // row even carries distinct EU pricing), including the `jp.` profile that AWS
 // does not actually expose for this model. We reproduce that shape so the test
 // exercises the real source → catalog path — `mapModelsDevToModels` plus the
@@ -65,7 +65,7 @@ const OPUS_5_MODELS_DEV_FIXTURE = {
 
 describe("Amazon Bedrock Claude Opus 5", () => {
 	test("source mapping plus generation policy yields exactly the AWS-documented inference-profile IDs", () => {
-		// Guard the source (models.dev descriptor + exclusion policy), not the
+		// Guard the source (stencil.so descriptor + exclusion policy), not the
 		// bundled snapshot: the assertion must break if the mapping or policy
 		// stops reproducing the documented IDs, and must not falsely fail when
 		// upstream metadata legitimately shifts.
@@ -80,10 +80,10 @@ describe("Amazon Bedrock Claude Opus 5", () => {
 
 		// Set semantics: the descriptor also derives an `eu.` variant from the
 		// bare `anthropic.` row, so `eu.` legitimately arrives from both that
-		// derivation and the standalone models.dev row (deduped downstream by
+		// derivation and the standalone stencil.so row (deduped downstream by
 		// the generator). We assert the documented ID coverage, not row count.
 		expect(new Set(opus5Ids)).toEqual(new Set(AWS_DOCUMENTED_OPUS_5_IDS));
-		// `models.dev` lists `jp.anthropic.claude-opus-5`, but Bedrock has no such
+		// `stencil.so` lists `jp.anthropic.claude-opus-5`, but Bedrock has no such
 		// inference profile for this model and would reject it, so the generation
 		// policy must drop it before it reaches the catalog.
 		expect(opus5Ids).not.toContain("jp.anthropic.claude-opus-5");
diff --git a/packages/catalog/test/azure-provider.test.ts b/packages/catalog/test/azure-provider.test.ts
index c213bcb98..01d2325d2 100644
--- a/packages/catalog/test/azure-provider.test.ts
+++ b/packages/catalog/test/azure-provider.test.ts
@@ -10,7 +10,7 @@ import {
 } from "@oh-my-pi/pi-catalog/provider-models";
 import type { ModelSpec } from "@oh-my-pi/pi-catalog/types";
 
-// A models.dev "azure" payload: two OpenAI-family models (one reasoning), a
+// A stencil.so "azure" payload: two OpenAI-family models (one reasoning), a
 // non-tool-capable instruct model, and a Foundry-hosted third party served via
 // a per-model `provider` override (claude over .services.ai.azure.com).
 const AZURE_MODELS_DEV_FIXTURE = {
@@ -37,7 +37,7 @@ describe("azure catalog provider", () => {
 		expect(DEFAULT_MODEL_PER_PROVIDER.azure).toBe("gpt-5.5");
 	});
 
-	test("models.dev descriptor keeps only OpenAI-family Responses models, baseUrl resolved at runtime", () => {
+	test("stencil.so descriptor keeps only OpenAI-family Responses models, baseUrl resolved at runtime", () => {
 		const azure = mapModelsDevToModels(AZURE_MODELS_DEV_FIXTURE, MODELS_DEV_PROVIDER_DESCRIPTORS).filter(
 			model => model.provider === "azure",
 		);
diff --git a/packages/catalog/test/coreweave-provider.test.ts b/packages/catalog/test/coreweave-provider.test.ts
index d695eaeea..5dd5ab952 100644
--- a/packages/catalog/test/coreweave-provider.test.ts
+++ b/packages/catalog/test/coreweave-provider.test.ts
@@ -89,7 +89,7 @@ describe("CoreWeave Serverless Inference provider support", () => {
 		});
 	});
 
-	test("maps models.dev wandb metadata into OpenAI chat completions models", () => {
+	test("maps stencil.so wandb metadata into OpenAI chat completions models", () => {
 		const mapped = mapModelsDevToModels(
 			{
 				wandb: {
diff --git a/packages/catalog/test/fireworks-serverless-discovery.test.ts b/packages/catalog/test/fireworks-serverless-discovery.test.ts
index 834d70833..31367fa5b 100644
--- a/packages/catalog/test/fireworks-serverless-discovery.test.ts
+++ b/packages/catalog/test/fireworks-serverless-discovery.test.ts
@@ -79,9 +79,9 @@ function createMockFetch(): { fetch: FetchImpl; controlPlaneUrls: string[] } {
 	const controlPlaneUrls: string[] = [];
 	const fetch = (async (input: string | URL | Request): Promise<Response> => {
 		const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
-		// models.dev reference fetch — return an empty catalog so the mapper relies
+		// stencil.so reference fetch — return an empty catalog so the mapper relies
 		// purely on control-plane + bundled references.
-		if (url.startsWith("https://models.dev")) {
+		if (url.startsWith("https://stencil.so")) {
 			return jsonResponse({});
 		}
 		if (url.includes("/v1/accounts/fireworks/models")) {
@@ -167,7 +167,7 @@ describe("Fireworks control-plane serverless discovery", () => {
 	it("returns null on a control-plane transport failure so the manager keeps its cache", async () => {
 		const fetch = (async (input: string | URL | Request): Promise<Response> => {
 			const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
-			if (url.startsWith("https://models.dev")) return jsonResponse({});
+			if (url.startsWith("https://stencil.so")) return jsonResponse({});
 			return new Response("server error", { status: 500 });
 		}) as unknown as FetchImpl;
 		const options = fireworksModelManagerOptions({ apiKey: "fw_test_key", fetch });
diff --git a/packages/catalog/test/google-vertex-discovery.test.ts b/packages/catalog/test/google-vertex-discovery.test.ts
index 7b7cf814e..06b5c3e4b 100644
--- a/packages/catalog/test/google-vertex-discovery.test.ts
+++ b/packages/catalog/test/google-vertex-discovery.test.ts
@@ -44,7 +44,7 @@ const googleVertexModelsDevPayload = {
 } satisfies Record<string, unknown>;
 
 describe("google-vertex model catalog", () => {
-	it("maps the models.dev Vertex catalog instead of the project discovery endpoint", () => {
+	it("maps the stencil.so Vertex catalog instead of the project discovery endpoint", () => {
 		const models = mapModelsDevToModels(googleVertexModelsDevPayload, MODELS_DEV_PROVIDER_DESCRIPTORS).filter(
 			model => model.provider === "google-vertex",
 		);
diff --git a/packages/catalog/test/issue-1617-repro.test.ts b/packages/catalog/test/issue-1617-repro.test.ts
index e80ae88da..f07089ed7 100644
--- a/packages/catalog/test/issue-1617-repro.test.ts
+++ b/packages/catalog/test/issue-1617-repro.test.ts
@@ -6,7 +6,7 @@
  * `<|minimax|>`) leaking into the UI because OMP POSTs anthropic-shaped
  * requests to /v1/messages and the gateway returns non-Anthropic responses.
  *
- * models.dev declares these ids with `provider.npm = "@ai-sdk/anthropic"`,
+ * stencil.so declares these ids with `provider.npm = "@ai-sdk/anthropic"`,
  * which by default would resolve to anthropic-messages on opencode-zen/-go.
  * The descriptor must override these specific ids to openai-completions so
  * that regenerated models.json keeps the correct routing, AND so the
@@ -29,9 +29,9 @@ describe("opencode-zen/-go resolver routes MiniMax M3 to openai-completions (iss
 	const zenDescriptor = MODELS_DEV_PROVIDER_DESCRIPTORS.find(d => d.providerId === "opencode-zen");
 	const goDescriptor = MODELS_DEV_PROVIDER_DESCRIPTORS.find(d => d.providerId === "opencode-go");
 
-	// Per upstream models.dev (verified 2026-06-02 against
-	// https://models.dev/api.json["opencode"].models and
-	// https://models.dev/api.json["opencode-go"].models), the affected ids
+	// Per upstream stencil.so (verified 2026-06-02 against
+	// https://stencil.so/api.json["opencode"].models and
+	// https://stencil.so/api.json["opencode-go"].models), the affected ids
 	// carry `provider.npm = "@ai-sdk/anthropic"`. The naive @ai-sdk/anthropic
 	// rule would route them to /v1/messages on opencode.ai/zen[/go] which
 	// 404s. Per-id overrides must win.
diff --git a/packages/catalog/test/issue-2883-moonshot-china.test.ts b/packages/catalog/test/issue-2883-moonshot-china.test.ts
index cb0404e39..bb49472cd 100644
--- a/packages/catalog/test/issue-2883-moonshot-china.test.ts
+++ b/packages/catalog/test/issue-2883-moonshot-china.test.ts
@@ -4,7 +4,7 @@ import { moonshotModelManagerOptions } from "@oh-my-pi/pi-catalog/provider-model
 import type { FetchImpl } from "@oh-my-pi/pi-catalog/types";
 import { $pickenv } from "@oh-my-pi/pi-utils";
 
-const MODELS_DEV_URL = "https://models.dev/api.json";
+const MODELS_DEV_URL = "https://catalog.stencil.so/models.json.zstd";
 
 const ORIGINAL_ENV: Record<string, string | undefined> = {
 	MOONSHOT_BASE_URL: Bun.env.MOONSHOT_BASE_URL,
diff --git a/packages/catalog/test/issue-5598-repro.test.ts b/packages/catalog/test/issue-5598-repro.test.ts
index 08390eb0a..51cc769b0 100644
--- a/packages/catalog/test/issue-5598-repro.test.ts
+++ b/packages/catalog/test/issue-5598-repro.test.ts
@@ -5,12 +5,12 @@ import {
 } from "@oh-my-pi/pi-catalog/provider-models/openai-compat";
 
 // Z.AI GLM coding-plan token costs all showed as "Free" (issue #5598): the `zai`
-// provider descriptor sourced the models.dev `zai-coding-plan` key, which reports
+// provider descriptor sourced the stencil.so `zai-coding-plan` key, which reports
 // all-$0 subscription rates. The `zai` (pay-as-you-go) key carries the real
 // per-token rates for the identical GLM ids, matching how other subscription
 // providers surface comparison pricing in `/models`.
-describe("zai GLM pricing sources the PAYG models.dev key (issue #5598)", () => {
-	test("descriptor maps the `zai` models.dev key, not `zai-coding-plan`", () => {
+describe("zai GLM pricing sources the PAYG stencil.so key (issue #5598)", () => {
+	test("descriptor maps the `zai` stencil.so key, not `zai-coding-plan`", () => {
 		const descriptor = MODELS_DEV_PROVIDER_DESCRIPTORS.find(d => d.providerId === "zai");
 		expect(descriptor).toBeDefined();
 		expect(descriptor?.modelsDevKey).toBe("zai");
diff --git a/packages/catalog/test/issue-5756-repro.test.ts b/packages/catalog/test/issue-5756-repro.test.ts
index 50452f157..f1aab7ef0 100644
--- a/packages/catalog/test/issue-5756-repro.test.ts
+++ b/packages/catalog/test/issue-5756-repro.test.ts
@@ -2,7 +2,7 @@
  * Issue #5756 — `moonshot/kimi-k3 is incorrectly shown as free`
  *
  * The native Moonshot `kimi-k3` entry is dynamically discovered but has no
- * bundled/models.dev reference, so `mapWithBundledReference` produced the
+ * bundled/stencil.so reference, so `mapWithBundledReference` produced the
  * generic dynamic defaults: zero token cost, null limits, text-only input,
  * and `reasoning: false`. `/models` then labeled the paid model "Free".
  *
diff --git a/packages/catalog/test/issue-6563-repro.test.ts b/packages/catalog/test/issue-6563-repro.test.ts
index 318389f11..b04be3cdd 100644
--- a/packages/catalog/test/issue-6563-repro.test.ts
+++ b/packages/catalog/test/issue-6563-repro.test.ts
@@ -7,7 +7,7 @@
  * override verbatim, so generic discovery requested
  * `https://api.anthropic.com/models` (404) instead of `/v1/models`. The failed
  * refresh then retained a stale text-only cache row, which `mergeDynamicModel`
- * treated as authoritative over fresh models.dev vision metadata — leaving
+ * treated as authoritative over fresh stencil.so vision metadata — leaving
  * `claude-opus-5` marked text-only and snapcompact refusing to run.
  *
  * The fix normalizes the discovery URL to always end in `/v1` while model rows
@@ -22,7 +22,7 @@ function modelsDevResponse(): Response {
 	const body = {
 		anthropic: {
 			models: {
-				// Not in the bundled catalog: capability must come from models.dev
+				// Not in the bundled catalog: capability must come from stencil.so
 				// through the discovery path under repair.
 				"claude-test-vision-1": {
 					name: "Claude Test Vision",
@@ -54,7 +54,7 @@ describe("issue #6563 — anthropic discovery base URL missing /v1", () => {
 		const fetchMock = (async (input: string | URL | Request): Promise<Response> => {
 			const url = String(input instanceof Request ? input.url : input);
 			requestedUrls.push(url);
-			if (url === "https://models.dev/api.json") return modelsDevResponse();
+			if (url === "https://catalog.stencil.so/models.json.zstd") return modelsDevResponse();
 			if (url === `${PROVIDER_BASE_URL}/v1/models`) return anthropicModelsResponse();
 			return new Response("not found", { status: 404 });
 		}) as typeof fetch;
@@ -78,7 +78,7 @@ describe("issue #6563 — anthropic discovery base URL missing /v1", () => {
 		// change that would make stale capabilities authoritative.
 		expect(opus5?.baseUrl).toBe(PROVIDER_BASE_URL);
 
-		// A model absent from the bundled catalog picks up vision from models.dev.
+		// A model absent from the bundled catalog picks up vision from stencil.so.
 		const unbundled = models?.find(m => m.id === "claude-test-vision-1");
 		expect(unbundled?.input).toContain("image");
 		expect(unbundled?.baseUrl).toBe(PROVIDER_BASE_URL);
diff --git a/packages/catalog/test/issue-830-repro.test.ts b/packages/catalog/test/issue-830-repro.test.ts
index 011e7148e..b65b980a0 100644
--- a/packages/catalog/test/issue-830-repro.test.ts
+++ b/packages/catalog/test/issue-830-repro.test.ts
@@ -34,7 +34,7 @@ describe("deepseek built-in provider (issue #830)", () => {
 		}
 	});
 
-	test("models.dev mapping descriptor uses api.deepseek.com and forces reasoning_content + no tool_choice", () => {
+	test("stencil.so mapping descriptor uses api.deepseek.com and forces reasoning_content + no tool_choice", () => {
 		const descriptor = MODELS_DEV_PROVIDER_DESCRIPTORS.find(d => d.providerId === "deepseek");
 		expect(descriptor).toBeDefined();
 		expect(descriptor?.modelsDevKey).toBe("deepseek");
diff --git a/packages/catalog/test/issue-887-repro.test.ts b/packages/catalog/test/issue-887-repro.test.ts
index e91d728a4..2fac1dbee 100644
--- a/packages/catalog/test/issue-887-repro.test.ts
+++ b/packages/catalog/test/issue-887-repro.test.ts
@@ -3,7 +3,7 @@
  * because the resolver routes them to anthropic-messages /v1/messages while
  * the OpenCode Go gateway only serves them at /v1/chat/completions.
  *
- * models.dev declares these ids with `provider.npm = "@ai-sdk/anthropic"`,
+ * stencil.so declares these ids with `provider.npm = "@ai-sdk/anthropic"`,
  * which by default would resolve to anthropic-messages on opencode-go. The
  * descriptor must override these specific ids to openai-completions so that
  * regenerated models.json keeps the correct routing.
@@ -20,8 +20,8 @@ const OPENCODE_GO_BASE = "https://opencode.ai/zen/go/v1";
 describe("opencode-go resolver routes 404-ing ids to openai-completions (issue #887)", () => {
 	const descriptor = MODELS_DEV_PROVIDER_DESCRIPTORS.find(d => d.providerId === "opencode-go");
 
-	// Per upstream models.dev (verified 2026-05-02 against
-	// https://models.dev/api.json["opencode-go"].models), these three ids carry
+	// Per upstream stencil.so (verified 2026-05-02 against
+	// https://stencil.so/api.json["opencode-go"].models), these three ids carry
 	// `provider.npm = "@ai-sdk/anthropic"`. The naive @ai-sdk/anthropic rule
 	// would route them to /v1/messages on opencode.ai/zen/go which 404s.
 	const npmAnthropic: ModelsDevModel = { provider: { npm: "@ai-sdk/anthropic" }, tool_call: true };
@@ -35,7 +35,7 @@ describe("opencode-go resolver routes 404-ing ids to openai-completions (issue #
 	);
 
 	test("minimax-m2.5 (control: works empirically) also resolves to openai-completions", () => {
-		// models.dev currently lists minimax-m2.5 without an explicit provider.npm,
+		// stencil.so currently lists minimax-m2.5 without an explicit provider.npm,
 		// so it falls through to the default openai-completions resolution.
 		const m25: ModelsDevModel = { tool_call: true };
 		const resolved = descriptor?.resolveApi?.("minimax-m2.5", m25);
diff --git a/packages/catalog/test/litellm-provider.test.ts b/packages/catalog/test/litellm-provider.test.ts
index 24183fd24..619a1b6a0 100644
--- a/packages/catalog/test/litellm-provider.test.ts
+++ b/packages/catalog/test/litellm-provider.test.ts
@@ -4,7 +4,7 @@ import type { FetchImpl } from "@oh-my-pi/pi-catalog/types";
 import * as logger from "@oh-my-pi/pi-utils/logger";
 
 const ORIGINAL_LITELLM_BASE_URL = Bun.env.LITELLM_BASE_URL;
-const MODELS_DEV_URL = "https://models.dev/api.json";
+const MODELS_DEV_URL = "https://catalog.stencil.so/models.json.zstd";
 function makeLiteLLMSentinelPlaceholder(modelGroup: string) {
 	return {
 		model_group: modelGroup,
@@ -156,7 +156,7 @@ describe("LiteLLM provider discovery", () => {
 		expect(models?.[0]?.baseUrl).toBe("http://litellm-config.example:4200/v1");
 	});
 
-	test("keeps LiteLLM transport when models.dev has a colliding provider model id", async () => {
+	test("keeps LiteLLM transport when stencil.so has a colliding provider model id", async () => {
 		const fetchMock = makeCollisionFetchMock();
 
 		const options = litellmModelManagerOptions({
@@ -306,7 +306,7 @@ describe("LiteLLM provider discovery", () => {
 		expect(warnSpy).not.toHaveBeenCalled();
 	});
 
-	test("maps LiteLLM per-token cost onto cost.input/output for models missing from models.dev", async () => {
+	test("maps LiteLLM per-token cost onto cost.input/output for models missing from stencil.so", async () => {
 		const fetchMock = vi.fn(async (input: string | URL | Request) => {
 			const url = inputUrl(input);
 			if (url === MODELS_DEV_URL) {
@@ -349,7 +349,7 @@ describe("LiteLLM provider discovery", () => {
 		});
 	});
 
-	test("enriches LiteLLM rich models missing from models.dev with bundled reasoning metadata", async () => {
+	test("enriches LiteLLM rich models missing from stencil.so with bundled reasoning metadata", async () => {
 		const fetchMock = vi.fn(async (input: string | URL | Request) => {
 			const url = inputUrl(input);
 			if (url === MODELS_DEV_URL) {
@@ -778,7 +778,7 @@ describe("LiteLLM provider discovery", () => {
 		});
 	});
 
-	test("enriches LiteLLM /v1/models fallback entries missing from models.dev with bundled reasoning metadata", async () => {
+	test("enriches LiteLLM /v1/models fallback entries missing from stencil.so with bundled reasoning metadata", async () => {
 		const calls: string[] = [];
 		const fetchMock = vi.fn(async (input: string | URL | Request) => {
 			const url = inputUrl(input);
diff --git a/packages/catalog/test/siliconflow-provider.test.ts b/packages/catalog/test/siliconflow-provider.test.ts
index 5aba51586..57c192fc0 100644
--- a/packages/catalog/test/siliconflow-provider.test.ts
+++ b/packages/catalog/test/siliconflow-provider.test.ts
@@ -82,7 +82,7 @@ describe("siliconflow built-in providers", () => {
 			expect(entry?.dynamicModelsAuthoritative).toBe(true);
 			expect(entry?.catalogDiscovery).toBeUndefined();
 		}
-		// Runtime: no models.dev mapping may feed the generator either.
+		// Runtime: no stencil.so mapping may feed the generator either.
 		expect(MODELS_DEV_PROVIDER_DESCRIPTORS.some(d => d.providerId === "siliconflow")).toBe(false);
 		expect(MODELS_DEV_PROVIDER_DESCRIPTORS.some(d => d.providerId === "siliconflow-cn")).toBe(false);
 	});
@@ -106,12 +106,12 @@ describe("siliconflow built-in providers", () => {
 		});
 	});
 
-	test("dynamic discovery filters non-chat ids and hydrates metadata from models.dev and bundled references", async () => {
+	test("dynamic discovery filters non-chat ids and hydrates metadata from stencil.so and bundled references", async () => {
 		const seen: { urls: string[]; authorization?: string } = { urls: [] };
 		const stubFetch: FetchImpl = async (input, init) => {
 			const url = String(input);
 			seen.urls.push(url);
-			if (url.startsWith("https://models.dev/")) {
+			if (url.startsWith("https://catalog.stencil.so/")) {
 				return new Response(JSON.stringify(MODELS_DEV_STUB_PAYLOAD), {
 					status: 200,
 					headers: { "content-type": "application/json" },
@@ -142,7 +142,7 @@ describe("siliconflow built-in providers", () => {
 		expect(models).not.toBeNull();
 		expect((models ?? []).map(model => model.id)).toEqual(["deepseek-ai/DeepSeek-V4-Pro", "zai-org/GLM-5.1"]);
 
-		// Tier 1: models.dev carries the id — pricing, limits, and reasoning hydrate.
+		// Tier 1: stencil.so carries the id — pricing, limits, and reasoning hydrate.
 		const glm = models?.find(model => model.id === "zai-org/GLM-5.1");
 		expect(glm?.reasoning).toBe(true);
 		expect(glm?.contextWindow).toBe(205000);
@@ -152,7 +152,7 @@ describe("siliconflow built-in providers", () => {
 		expect(glm?.api).toBe("openai-completions");
 		expect(glm?.baseUrl).toBe("https://api.siliconflow.com/v1");
 
-		// Tier 2: absent from models.dev — reasoning and canonical limits recover
+		// Tier 2: absent from stencil.so — reasoning and canonical limits recover
 		// from the bundled upstream/reseller reference, but provider-specific
 		// pricing stays unknown instead of inheriting another host's values.
 		const canonical = resolveModelReference("deepseek-ai/DeepSeek-V4-Pro", getBundledModelReferenceIndex());
@@ -168,16 +168,16 @@ describe("siliconflow built-in providers", () => {
 		}
 
 		expect(seen.urls).toContain("https://api.siliconflow.com/v1/models");
-		expect(seen.urls.some(url => url.startsWith("https://models.dev/"))).toBe(true);
+		expect(seen.urls.some(url => url.startsWith("https://catalog.stencil.so/"))).toBe(true);
 		expect(seen.authorization).toBe("Bearer sk-test");
 	});
 
-	test("cn variant discovers against the China endpoint with cn models.dev pricing", async () => {
+	test("cn variant discovers against the China endpoint with cn stencil.so pricing", async () => {
 		const seen: { urls: string[] } = { urls: [] };
 		const stubFetch: FetchImpl = async input => {
 			const url = String(input);
 			seen.urls.push(url);
-			if (url.startsWith("https://models.dev/")) {
+			if (url.startsWith("https://catalog.stencil.so/")) {
 				return new Response(JSON.stringify(MODELS_DEV_STUB_PAYLOAD), {
 					status: 200,
 					headers: { "content-type": "application/json" },
@@ -204,11 +204,11 @@ describe("siliconflow built-in providers", () => {
 		expect(seen.urls).toContain("https://api.siliconflow.cn/v1/models");
 	});
 
-	test("models.dev lookup failure still yields endpoint-discovered models", async () => {
+	test("stencil.so lookup failure still yields endpoint-discovered models", async () => {
 		const stubFetch: FetchImpl = async input => {
 			const url = String(input);
-			if (url.startsWith("https://models.dev/")) {
-				throw new Error("models.dev stalled");
+			if (url.startsWith("https://catalog.stencil.so/")) {
+				throw new Error("stencil.so stalled");
 			}
 			const payload = {
 				object: "list",
@@ -223,7 +223,7 @@ describe("siliconflow built-in providers", () => {
 		const options = siliconflowCnModelManagerOptions({ apiKey: "sk-test", fetch: stubFetch });
 		const models = await options.fetchDynamicModels?.();
 		expect(models?.map(model => model.id)).toEqual(["deepseek-ai/DeepSeek-V4-Pro"]);
-		// Canonical fallback still hydrates reasoning when models.dev is unreachable.
+		// Canonical fallback still hydrates reasoning when stencil.so is unreachable.
 		expect(models?.[0]?.reasoning).toBe(true);
 	});
 });
diff --git a/packages/catalog/test/umans-provider.test.ts b/packages/catalog/test/umans-provider.test.ts
index 197ac6431..8ad3cafbc 100644
--- a/packages/catalog/test/umans-provider.test.ts
+++ b/packages/catalog/test/umans-provider.test.ts
@@ -228,7 +228,7 @@ describe("umans provider catalog", () => {
 		}
 	});
 
-	it("maps the models.dev Umans PAYG pricing to the Anthropic endpoint", () => {
+	it("maps the stencil.so Umans PAYG pricing to the Anthropic endpoint", () => {
 		const models = mapModelsDevToModels(
 			{
 				"umans-ai": {
diff --git a/packages/coding-agent/test/model-discovery.test.ts b/packages/coding-agent/test/model-discovery.test.ts
index c408dac34..d3d66fca1 100644
--- a/packages/coding-agent/test/model-discovery.test.ts
+++ b/packages/coding-agent/test/model-discovery.test.ts
@@ -154,7 +154,7 @@ describe("ModelRegistry runtime discovery", () => {
 		const endpointPrefix = "https://api.anthropic.com/";
 		return async (input, init) => {
 			const url = String(input);
-			if (url === "https://models.dev/api.json") {
+			if (url === "https://catalog.stencil.so/models.json.zstd") {
 				return Response.json({});
 			}
 			if (url.startsWith(endpointPrefix) && url.endsWith("/models")) {
@@ -1870,6 +1870,9 @@ describe("ModelRegistry runtime discovery", () => {
 
 	test("llama.cpp selected model refresh does not resolve command api keys", async () => {
 		const commandLogPath = path.join(tempDir, "llama-cpp-key-command.log");
+		// Pre-create so the before/after comparison works whether or not
+		// registry construction happens to invoke the key command itself.
+		fs.writeFileSync(commandLogPath, "");
 		writeRawModelsJson({
 			"llama.cpp": {
 				baseUrl: "http://127.0.0.1:8080",
diff --git a/packages/coding-agent/test/model-registry-runtime-provider.test.ts b/packages/coding-agent/test/model-registry-runtime-provider.test.ts
index dc3f5f25c..f7280e48c 100644
--- a/packages/coding-agent/test/model-registry-runtime-provider.test.ts
+++ b/packages/coding-agent/test/model-registry-runtime-provider.test.ts
@@ -27,7 +27,7 @@ describe("ModelRegistry runtime provider registration", () => {
 
 	// Stub transport: reject every request so refresh("online") drives the full
 	// online discovery path with deterministic, instant failures instead of real
-	// network. Provider fetches (dynamic + models.dev) are caught and swallowed,
+	// network. Provider fetches (dynamic + stencil.so) are caught and swallowed,
 	// leaving the registry with its bundled catalog plus runtime overlays.
 	const offlineFetch: FetchImpl = () => Promise.reject(new Error("network disabled in model-registry runtime test"));
 
diff --git a/packages/coding-agent/test/model-registry.test.ts b/packages/coding-agent/test/model-registry.test.ts
index 5ee260cdf..6e3694f9b 100644
--- a/packages/coding-agent/test/model-registry.test.ts
+++ b/packages/coding-agent/test/model-registry.test.ts
@@ -702,7 +702,7 @@ describe("ModelRegistry", () => {
 			});
 			const fetchMock: FetchImpl = async input => {
 				const url = String(input);
-				if (url === "https://models.dev/api.json") return Response.json({});
+				if (url === "https://catalog.stencil.so/models.json.zstd") return Response.json({});
 				if (url === "https://proxy.example/v1/models") {
 					return Response.json({
 						data: [{ id: "claude-sonnet-5", display_name: "Claude Sonnet 5" }],