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codex - 💡(How to fix) Fix On macOS 15.7.5, Codex Desktop causes severe overheating when a session is opened in the mini window. [1 comments, 2 participants]

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openai/codex#19253•Fetched 2026-04-24 10:40:05
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What version of the Codex App are you using (From “About Codex” dialog)?

26.422.21459

What subscription do you have?

Plus

What platform is your computer?

macOS 15.7.5 .macbook Air M4.

What issue are you seeing?

Opening the session in the mini window causes severe heating. Returning to the default window makes the temperature recover.

<img width="1402" height="458" alt="Image" src="https://github.com/user-attachments/assets/d2b243c2-ee6c-40ed-ade0-aac038692151" />

What steps can reproduce the bug?

  1. Open Codex Desktop.
  2. Start or open a session.
  3. Switch the session to the mini window.
  4. Wait briefly and observe system temperature / fan / Activity Monitor.
  5. Switch back to the default window.
  6. Observe that temperature and CPU usage return to normal.

What is the expected behavior?

Mini window should not cause sustained high CPU/GPU usage or abnormal heating when idle or lightly used.

Additional information

No response

extent analysis

TL;DR

The issue is likely related to high CPU/GPU usage when using the mini window in Codex App version 26.422.21459, and switching back to the default window resolves the issue.

Guidance

  • Verify that the high CPU/GPU usage is specific to the mini window by monitoring system resources using Activity Monitor while reproducing the issue.
  • Try closing and reopening the session in the mini window to see if the issue persists.
  • Check if other resource-intensive applications are running in the background that could be contributing to the heating issue.
  • Consider reporting the issue to the Codex App support team with detailed system specifications and usage patterns for further investigation.

Notes

The provided information suggests a potential bug in the Codex App, but without more technical details, it's difficult to pinpoint the exact cause.

Recommendation

Apply workaround: Avoid using the mini window or switch back to the default window when not actively using the session to mitigate the heating issue, until a fix is available from the Codex App team.

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#retriever error#indexing error#inference speed#output truncation#response parsing

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