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codex - 💡(How to fix) Fix Cannot find how to turn off Fast mode in Codex app on macOS Apple Silicon [1 comments, 2 participants]

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openai/codex#20061•Fetched 2026-04-29 06:23:22
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Root Cause

This is confusing because Codex CLI reports Fast mode is off, but the Codex app model selector still shows ⚡ 5.5 High.

RAW_BUFFERClick to expand / collapse

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

Version 26.422.62136 (2180)

What subscription do you have?

Business

What platform is your computer?

Darwin 25.4.0 arm64 arm

What issue are you seeing?

I cannot find a clear way to turn off Fast mode in the Codex app UI on macOS. The model selector shows a lightning icon next to 5.5 High, but there is no visible menu option to disable Fast mode.

<img width="492" height="452" alt="Image" src="https://github.com/user-attachments/assets/5885b54f-fc92-43d8-b44c-63aec78cf957" />

What steps can reproduce the bug?

Uploaded thread: 019c4340-195a-79b3-84b0-908cb61110fc Steps to reproduce:

  1. Open the Codex app on macOS Apple Silicon / M2 Pro.
  2. Open a local workspace.
  3. Select GPT-5.5 with High intelligence.
  4. Observe that the model selector shows ⚡ 5.5 High.
  5. Click the model selector.
  6. The menu only shows Intelligence options: Low, Medium, High, Extra High, plus model choices such as GPT-5.5 / GPT-5.4 / Other models.
  7. There is no visible option to turn Fast mode off.
  8. Try typing /fast off in the Codex app chat composer.
  9. The app treats /fast off as a normal instruction, not as a command.
  10. Open Codex CLI separately and run /fast off.
  11. CLI reports Fast mode is off, and ~/.codex/config.toml contains:
[notice]
fast_default_opt_out = true
12. Return to the Codex app UI.
13. The model selector still shows the lightning icon next to 5.5 High.

### What is the expected behavior?

The Codex app should provide a clear UI control to turn Fast mode on or off.

The UI should also clearly show whether Fast mode is actually active. If the lightning icon only means that the selected model supports Fast mode, the app should explain that. If it means Fast mode is active, it should disappear or change when Fast mode is off.

The app should also make it clear whether Fast mode settings are shared with Codex CLI or separate from the app UI.

### Additional information

This is confusing because Codex CLI reports `Fast mode is off`, but the Codex app model selector still shows `⚡ 5.5 High`.

I could not find any Fast mode toggle in the app UI. The `/fast off` command works in Codex CLI but not in the Codex app composer.

Feedback ID / uploaded thread:
019c4340-195a-79b3-84b0-908cb6110fc

extent analysis

TL;DR

The most likely fix is to add a UI control in the Codex app to toggle Fast mode on or off, or provide a clear indication of whether Fast mode is active.

Guidance

  • The issue seems to be a missing UI control for toggling Fast mode in the Codex app, despite the feature being available in the Codex CLI.
  • To verify if Fast mode is actually active, check the ~/.codex/config.toml file for the fast_default_opt_out setting.
  • Consider using the Codex CLI to toggle Fast mode until a UI control is available in the app.
  • The app should provide a clear indication of whether Fast mode is active, such as changing or removing the lightning icon next to the model selector.

Example

No code snippet is provided as it is not clearly supported by the issue.

Notes

The issue highlights a discrepancy between the Codex app UI and the Codex CLI, where the CLI reports Fast mode as off, but the app UI still shows the lightning icon.

Recommendation

Apply workaround: Use the Codex CLI to toggle Fast mode until a UI control is available in the app, as it provides a clear way to enable or disable Fast mode.

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#installation#tensor shape#autograd error#model save/load#optimization

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