diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 801d73776..818c79c7b 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -15,6 +15,10 @@
 
 - Fixed read-only collab sessions so prompting, interrupts, and other write actions are blocked with a read-only warning instead of being applied
 
+### Fixed
+
+- Fixed the interactive Model scope startup banner so models without an explicit thinking level do not show `:undefined`, and entries that were scoped without a `:level` are no longer rendered with the global default thinking level (which `applyRootSessionOptions` pre-fills on the cycling array for Ctrl+P) ([#2385](https://github.com/can1357/oh-my-pi/issues/2385)).
+
 ## [15.11.8] - 2026-06-12
 
 ### Added
diff --git a/packages/coding-agent/src/main.ts b/packages/coding-agent/src/main.ts
index 61c128380..5b2608af9 100644
--- a/packages/coding-agent/src/main.ts
+++ b/packages/coding-agent/src/main.ts
@@ -245,7 +245,7 @@ export interface InteractiveModeNotify {
 }
 
 export function buildModelScopeNotification(
-	scopedModelsForDisplay: readonly Pick<ScopedModel, "model" | "thinkingLevel">[],
+	scopedModelsForDisplay: readonly Pick<ScopedModel, "model" | "thinkingLevel" | "explicitThinkingLevel">[],
 	startupQuiet: boolean,
 ): InteractiveModeNotify | null {
 	if (startupQuiet || scopedModelsForDisplay.length === 0) {
@@ -253,13 +253,15 @@ export function buildModelScopeNotification(
 	}
 	const modelList = scopedModelsForDisplay
 		.map(scopedModel => {
-			const thinkingStr = scopedModel.thinkingLevel ? `:${scopedModel.thinkingLevel}` : "";
+			const thinkingStr =
+				scopedModel.explicitThinkingLevel && scopedModel.thinkingLevel
+					? `:${scopedModel.thinkingLevel}`
+					: "";
 			return `${scopedModel.model.id}${thinkingStr}`;
 		})
 		.join(", ");
 	return { kind: "info", message: `Model scope: ${modelList} (Ctrl+P to cycle)` };
 }
-
 export async function submitInteractiveInput(
 	mode: Pick<
 		InteractiveMode,
@@ -1283,9 +1285,8 @@ export async function runRootCommand(
 			const versionCheckPromise = checkForNewVersion(VERSION).catch(() => undefined);
 			const changelogMarkdown = await logger.time("main:getChangelogForDisplay", getChangelogForDisplay, parsedArgs);
 
-			const scopedModelsForDisplay = sessionOptions.scopedModels ?? scopedModels;
 			const modelScopeNotification = buildModelScopeNotification(
-				scopedModelsForDisplay,
+				scopedModels,
 				settingsInstance.get("startup.quiet"),
 			);
 			if (modelScopeNotification) {
diff --git a/packages/coding-agent/test/main-model-scope-notification.test.ts b/packages/coding-agent/test/main-model-scope-notification.test.ts
index 34bbde893..74ac039f8 100644
--- a/packages/coding-agent/test/main-model-scope-notification.test.ts
+++ b/packages/coding-agent/test/main-model-scope-notification.test.ts
@@ -1,8 +1,8 @@
 import { describe, expect, it } from "bun:test";
 import { buildModel } from "@oh-my-pi/pi-catalog/build";
 import type { ScopedModel } from "@oh-my-pi/pi-coding-agent/config/model-resolver";
+import type { ThinkingLevel } from "@oh-my-pi/pi-agent-core";
 import { buildModelScopeNotification } from "@oh-my-pi/pi-coding-agent/main";
-
 function scopedModel(id: string): ScopedModel {
 	return {
 		model: buildModel({
@@ -32,4 +32,22 @@ describe("buildModelScopeNotification", () => {
 			message: "Model scope: claude-sonnet-4-5 (Ctrl+P to cycle)",
 		});
 	});
+	it("includes thinking suffix only when explicitly scoped", () => {
+		const withExplicit = { ...scopedModel("claude-sonnet-4-5"), thinkingLevel: "high" as ThinkingLevel, explicitThinkingLevel: true };
+		expect(buildModelScopeNotification([withExplicit], false)).toEqual({
+			kind: "info",
+			message: "Model scope: claude-sonnet-4-5:high (Ctrl+P to cycle)",
+		});
+	});
+
+	it("hides the suffix when the level was filled from the global default", () => {
+		// `applyRootSessionOptions` fills `sessionOptions.scopedModels[*].thinkingLevel`
+		// with the global default for Ctrl+P cycling — the banner must not surface that
+		// default as if the user had scoped `:high`.
+		const withDefault = { ...scopedModel("claude-sonnet-4-5"), thinkingLevel: "high" as ThinkingLevel, explicitThinkingLevel: false };
+		expect(buildModelScopeNotification([withDefault], false)).toEqual({
+			kind: "info",
+			message: "Model scope: claude-sonnet-4-5 (Ctrl+P to cycle)",
+		});
+	});
 });