diff --git a/CHANGELOG.md b/CHANGELOG.md
index 615f561da3..35b3dd696b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@
 
 ### Fixed
 
+- Ignore background Cloudflare scripts and unrelated notices on usable ChatGPT
+  pages instead of reporting a browser challenge.
 - Wait for a saved ChatGPT conversation after its provisional `WEB:` route,
   recover interrupted sessions with that route, and keep response capture and
   reloads within the configured timeout.
diff --git a/docs/windows-work.md b/docs/windows-work.md
index 6df4306eb0..d902d47471 100644
--- a/docs/windows-work.md
+++ b/docs/windows-work.md
@@ -69,6 +69,11 @@ Read this when working on `ask_pro` from Windows and add new findings here.
 
 Future Windows gotchas belong here.
 
+- September 30: signed-in ChatGPT loads a `/challenge-platform/` script even
+  while its composer and the "Library is now Space" notice are visible. Script
+  presence is not a blocking challenge. Navigation only treats the Cloudflare
+  interstitial title as blocking when no visible enabled composer is available;
+  active login, MFA, and CAPTCHA surfaces remain handled by the intervention monitor.
 - September 10: the model picker exposes `Latest` (currently `6 Pro`). Select the
   literal `Latest` option and keep the reasoning slider on `Pro`. Tool work appears
   inside `[data-streaming-response-status]`; it is progress, not answer content.
diff --git a/src/browser/actions/navigation.ts b/src/browser/actions/navigation.ts
index 710345fbff..dfd4c5649c 100644
--- a/src/browser/actions/navigation.ts
+++ b/src/browser/actions/navigation.ts
@@ -1,5 +1,5 @@
 import type { ChromeClient, BrowserLogger } from "../types.js";
-import { CLOUDFLARE_SCRIPT_SELECTOR, CLOUDFLARE_TITLE, INPUT_SELECTORS } from "../constants.js";
+import { CLOUDFLARE_TITLE, INPUT_SELECTORS } from "../constants.js";
 import { delay } from "../utils.js";
 import { logDomFailure } from "../domDebug.js";
 import { BrowserAutomationError } from "../errors.js";
@@ -481,18 +481,18 @@ async function waitForPrompt(
 }
 
 async function isCloudflareInterstitial(Runtime: ChromeClient["Runtime"]): Promise<boolean> {
-  const { result: titleResult } = await Runtime.evaluate({
-    expression: "document.title",
-    returnByValue: true,
-  });
-  const title = typeof titleResult.value === "string" ? titleResult.value : "";
-  const challengeTitle = CLOUDFLARE_TITLE.toLowerCase();
-  if (title.toLowerCase().includes(challengeTitle)) {
-    return true;
-  }
-
   const { result } = await Runtime.evaluate({
-    expression: `Boolean(document.querySelector('${CLOUDFLARE_SCRIPT_SELECTOR}'))`,
+    expression: `(() => {
+      if (!document.title.toLowerCase().includes(${JSON.stringify(CLOUDFLARE_TITLE)})) return false;
+      const composers = document.querySelectorAll(${JSON.stringify(INPUT_SELECTORS.join(","))});
+      return !Array.from(composers).some((node) => {
+        if (node.hasAttribute('disabled') || node.closest('[hidden],[aria-hidden="true"],[inert]')) return false;
+        const style = getComputedStyle(node);
+        if (style.display === 'none' || style.visibility === 'hidden' || style.opacity === '0') return false;
+        const rect = node.getBoundingClientRect();
+        return rect.width > 0 && rect.height > 0;
+      });
+    })()`,
     returnByValue: true,
   });
   return Boolean(result.value);
diff --git a/src/browser/constants.ts b/src/browser/constants.ts
index 9151e36e74..a25819c19e 100644
--- a/src/browser/constants.ts
+++ b/src/browser/constants.ts
@@ -41,7 +41,6 @@ export const CONVERSATION_TURN_SELECTOR =
   "article[data-turn], div[data-turn], section[data-turn]";
 export const ASSISTANT_ROLE_SELECTOR =
   '[data-message-author-role="assistant"], [data-turn="assistant"]';
-export const CLOUDFLARE_SCRIPT_SELECTOR = 'script[src*="/challenge-platform/"]';
 export const CLOUDFLARE_TITLE = "just a moment";
 export const PROMPT_PRIMARY_SELECTOR = "#prompt-textarea";
 export const PROMPT_FALLBACK_SELECTOR = 'textarea[name="prompt-textarea"]';
diff --git a/tests/browser/index.test.ts b/tests/browser/index.test.ts
index ccb6813a3d..d323b0a4e7 100644
--- a/tests/browser/index.test.ts
+++ b/tests/browser/index.test.ts
@@ -5,7 +5,7 @@ import {
   runSubmissionWithRecoveryForTest,
   shouldPreserveBrowserOnErrorForTest,
 } from "../../src/browser/index.js";
-import { ensureLoggedIn } from "../../src/browser/pageActions.js";
+import { ensureLoggedIn, ensureNotBlocked } from "../../src/browser/pageActions.js";
 import { BrowserAutomationError } from "../../src/browser/errors.js";
 
 describe("shouldPreserveBrowserOnErrorForTest", () => {
@@ -366,6 +366,46 @@ describe("launch tab cleanup", () => {
   });
 });
 
+describe("navigation challenge detection", () => {
+  test.each([
+    { title: "ChatGPT", composerVisible: true, scriptPresent: true, blocked: false },
+    { title: "ChatGPT", composerVisible: false, scriptPresent: true, blocked: false },
+    { title: "Just a moment...", composerVisible: true, scriptPresent: true, blocked: false },
+    { title: "Just a moment...", composerVisible: false, scriptPresent: false, blocked: true },
+  ])("$title with composerVisible=$composerVisible: blocked=$blocked", async (page) => {
+    const composer = {
+      closest: () => null,
+      hasAttribute: () => false,
+      getBoundingClientRect: () => ({ width: 548, height: page.composerVisible ? 26 : 0 }),
+    };
+    const document = {
+      title: page.title,
+      body: { textContent: "Library is now Space" },
+      querySelector: (selector: string) =>
+        selector.startsWith("script") ? (page.scriptPresent ? {} : null) : composer,
+      querySelectorAll: () => [composer],
+    };
+    const Runtime = {
+      evaluate: async ({ expression }: { expression: string }) => ({
+        result: {
+          value: new Function("document", "getComputedStyle", `return ${expression}`)(
+            document,
+            () => ({ display: "block", visibility: "visible", opacity: "1" }),
+          ),
+        },
+      }),
+    };
+    const result = ensureNotBlocked(Runtime as never, false, () => {});
+    if (page.blocked) {
+      await expect(result).rejects.toMatchObject({
+        details: { stage: "cloudflare-challenge" },
+      });
+    } else {
+      await expect(result).resolves.toBeUndefined();
+    }
+  });
+});
+
 describe("human intervention detection", () => {
   test("detects login/challenge reasons from the page probe", async () => {
     const Runtime = {