[macOS Desktop] Built-in image_gen missing after auto-update to build 6119

What version of the Codex App are you using (From “About Codex” dialog)?

Codex Desktop app 26.727.51351, build 6119. The bundled CLI reports 0.146.0-alpha.9.2.

What subscription do you have?

ChatGPT Pro, authenticated through ChatGPT (no API key or custom model provider).

Which models were you using?

Reproduced with both gpt-5.6-sol and gpt-5.6-terra.

What platform is your computer?

macOS on Apple Silicon (arm64).

What issue are you seeing?

Built-in image generation disappeared after the macOS ChatGPT/Codex app auto-updated from build 5973 to build 6119 on 2026-08-04.

The bundled imagegen skill loads, but the session does not expose the built-in image generation tool. Codex reports that built-in image generation is unavailable and routes toward an API fallback. Normal built-in image generation should work through the ChatGPT Pro login and should not require OPENAI_API_KEY.

This is not a missing skill, disabled feature flag, general rate limit, provider, or network problem:

• image_generation is reported as stable and effective true.
• codex doctor reports install, config, authentication, and network healthy.
• The general Codex rate limit is not reached.
• The same account had successful pre-update calls to tools.image_gen__imagegen on CLI 0.146.0-alpha.3.1.
• After the update, no built-in image tool is exposed to new sessions.

What steps can reproduce the bug?

1. Sign in to the macOS Codex Desktop app using a ChatGPT Pro account.
2. Update the app from build 5973 to build 6119.
3. Start a new task.
4. Invoke $imagegen or ask Codex to generate an image.
5. Observe that the skill loads but the built-in image tool is unavailable.
6. Repeat in a new task with gpt-5.6-sol and gpt-5.6-terra; both fail the same way.

Uploaded diagnostic thread: 019fcc97-b9a3-7713-ad38-f275b429c647

Additional reproduction sessions:

• Sol: 019fcc74-f750-7411-a63a-eef8378e3095
• Terra: 019fcc7d-77e5-7721-b414-beefd0b40728
• Affected desktop task: 019fcc72-8f2c-7382-bcfb-ccca6592ed1a

What is the expected behavior?

A ChatGPT-authenticated Pro session should expose the built-in image generation tool when image_generation is enabled, without requiring an API key. If account-plan caching suppresses the tool, Codex should refresh or reconcile the plan state and show an actionable diagnostic rather than silently removing the tool.

Additional information

This may be related to #35923, which reports that Codex 0.146.0 can hide image generation for Pro users when a stale cached plan claim is treated as Free. I have not re-authenticated yet, so the uploaded diagnostics preserve the affected state for investigation.

No product images, API keys, passwords, or private prompt content are included in this public report.