codex - 💡(How to fix) Fix Reasoning level doesn't change for new 'Chat' threads [1 comments, 2 participants]

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openai/codex#18412Fetched 2026-04-18 05:54:49
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What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.415.30602 (1773)

What subscription do you have?

ChatGPT Pro

What platform is your computer?

MacOS Darwin 25.4.0 arm64 arm

What issue are you seeing?

Whenever I create a new Chat thread, it defaults the last used reasoning level to the thread. If I attempt to change it, the dropdown opens, I can select a different reasoning level, but it doesn't show the new reasoning level when the dropdown closes.

Feedback ID: d162698b-b968-49b1-8305-4b5deabc5051

<img width="766" height="292" alt="Image" src="https://github.com/user-attachments/assets/4910d146-6867-4abc-a2eb-1ebf4a4baf5b" />

In the above image you can see that the current reasoning level when the new chat thread popped up was 'Extra High' and I am attempting to select 'Medium'

<img width="771" height="285" alt="Image" src="https://github.com/user-attachments/assets/4560c767-e93b-4ad1-b711-8df67945a6c0" />

After selecting medium the dropdown closes but the "selected" reasoning level stays at 'Extra High'.

What steps can reproduce the bug?

Uploaded thread: d162698b-b968-49b1-8305-4b5deabc5051

  • Click New Chat (Opt + Cmd + N)
  • Before submitting a prompt attempt to change the reasoning level
  • Once the dropdown dissapears, the reasoning level will not change

What is the expected behavior?

Upon selecting a new reasoning level from the new chat's dropdown, the reasoning level will change to the selected reasoning level

Additional information

No response

extent analysis

TL;DR

The issue can be mitigated by changing the reasoning level after submitting the prompt, as the dropdown selection does not update the reasoning level before submission.

Guidance

  • The problem seems to be related to the dropdown selection not updating the reasoning level before submitting the prompt.
  • To verify, try changing the reasoning level after submitting the prompt to see if it updates correctly.
  • As a temporary workaround, submit the prompt and then change the reasoning level, which should update correctly.
  • The issue might be specific to the version of the Codex App being used (Version 26.415.30602), and checking for updates or reporting the issue to the developers could provide a more permanent fix.

Notes

The provided information does not give clear insight into the underlying cause of the issue, so these suggestions are based on the symptoms described.

Recommendation

Apply workaround: The best course of action seems to be to submit the prompt and then change the reasoning level, as this is the most straightforward way to achieve the desired behavior given the current functionality of the app.

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codex - 💡(How to fix) Fix Reasoning level doesn't change for new 'Chat' threads [1 comments, 2 participants]