diff --git a/packages/ai/test/deepseek-reasoning-content.test.ts b/packages/ai/test/deepseek-reasoning-content.test.ts
index 502bb9a6d..4f770a5ba 100644
--- a/packages/ai/test/deepseek-reasoning-content.test.ts
+++ b/packages/ai/test/deepseek-reasoning-content.test.ts
@@ -68,7 +68,7 @@ function assistantToolCall(
 describe("DeepSeek reasoning_content tool-call replay", () => {
 	// ----------------------------------------------------------------
 	// Fix 1: honest wire-exact ladders for DeepSeek-family on any provider —
-	// V4 Flash exposes [low, high, max] (#7668), V4 Pro stays [high, max].
+	// V4 Flash and Pro expose [low, high, max] (#7668, #8405).
 	// ----------------------------------------------------------------
 	describe("thinking ladder (Fix 1)", () => {
 		it("bakes the honest [low, high, max] flash ladder with no effortMap on opencode-go", () => {
@@ -91,13 +91,13 @@ describe("DeepSeek reasoning_content tool-call replay", () => {
 			expect(model.thinking?.effortMap).toBeUndefined();
 		});
 
-		it("bakes the honest [high, max] ladder with no effortMap on the official endpoint", () => {
+		it("bakes the honest [low, high, max] ladder with no effortMap on the official endpoint", () => {
 			const model = deepseekModel({
 				provider: "deepseek",
 				baseUrl: "https://api.deepseek.com/v1",
 				id: "deepseek-v4-pro",
 			});
-			expect(model.thinking?.efforts).toEqual([Effort.High, Effort.Max]);
+			expect(model.thinking?.efforts).toEqual([Effort.Low, Effort.High, Effort.Max]);
 			expect(model.thinking?.effortMap).toBeUndefined();
 		});
 
diff --git a/packages/coding-agent/test/agent-session-retry-fallback.test.ts b/packages/coding-agent/test/agent-session-retry-fallback.test.ts
index 7573f3e96..3696e2e37 100644
--- a/packages/coding-agent/test/agent-session-retry-fallback.test.ts
+++ b/packages/coding-agent/test/agent-session-retry-fallback.test.ts
@@ -4108,7 +4108,7 @@ describe("AgentSession retry fallback", () => {
 
 	it("skips usage fallbacks whose effort floor exceeds the session ceiling", async () => {
 		const primaryModel = getBundledModel("anthropic", "claude-sonnet-4-5");
-		const incompatibleFallback = getBundledModel("fireworks", "deepseek-v4-pro");
+		const incompatibleFallback = getBundledModel("openrouter", "deepseek/deepseek-v4-pro");
 		const compatibleFallback = getBundledModel("openai", "gpt-4o-mini");
 		if (!primaryModel || !incompatibleFallback || !compatibleFallback) {
 			throw new Error("Expected bundled usage fallback effort models");
diff --git a/packages/coding-agent/test/tools/browser-tab-evaluate.test.ts b/packages/coding-agent/test/tools/browser-tab-evaluate.test.ts
index 30c299a20..f255a827b 100644
--- a/packages/coding-agent/test/tools/browser-tab-evaluate.test.ts
+++ b/packages/coding-agent/test/tools/browser-tab-evaluate.test.ts
@@ -1,4 +1,4 @@
-import { describe, expect, it, vi } from "bun:test";
+import { afterAll, beforeAll, describe, expect, it, vi } from "bun:test";
 import { Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import type { ToolSession } from "@oh-my-pi/pi-coding-agent/sdk";
 import { BrowserTool } from "@oh-my-pi/pi-coding-agent/tools/browser";
@@ -19,6 +19,23 @@ function makeSession(): ToolSession {
 }
 
 describe.skipIf(!CHROMIUM_AVAILABLE)("browser tab evaluation", () => {
+	const suiteTool = new BrowserTool(makeSession());
+	const suiteTabName = `evaluation-suite-${process.pid}`;
+
+	// Keep one browser lease across the suite. Tests still get isolated tabs and workers,
+	// while the chunked full run avoids relaunching Chromium for every test under load.
+	beforeAll(async () => {
+		await suiteTool.execute("open", {
+			action: "open",
+			name: suiteTabName,
+			url: "data:text/html,<title>Browser evaluation suite</title>",
+		});
+	}, 30_000);
+
+	afterAll(async () => {
+		await suiteTool.execute("close", { action: "close", name: suiteTabName, kill: true });
+	}, 30_000);
+
 	// Launches real headless Chromium; CI cold start easily exceeds bun's 5s default.
 	it("runs tab.evaluate in the page's main JavaScript world", async () => {
 		const tool = new BrowserTool(makeSession());