Context is lost after switching models
Open 💬 2 comments Opened Jun 23, 2026 by ceilf6
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of the Codex App are you using (From “About Codex” dialog)?
26.616.71553
What subscription do you have?
ChatGPT Plus
What platform is your computer?
Darwin 25.3.0 arm64 arm
What issue are you seeing?
<img width="944" height="783" alt="Image" src="https://github.com/user-attachments/assets/8719fb84-b32d-442f-aae9-30b341cfd61f" />
After switching models inside an existing conversation, the app appears to lose or ignore the previous conversation context.
By the way the reason why I switched models was that the app first showed an error indicating that the gpt-5.5 model could not be found or was unavailable.
What steps can reproduce the bug?
Switch the model from GPT-5.4 to GPT-5.5 using the model selector.
What is the expected behavior?
_No response_
Additional information
_No response_
2 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/aaabcf11-8b74-44bb-a50b-9f3195e76359" />
unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: a100a5f94fac33cf-NRT, request id: 00e5affc-1b5e-4a48-b845-d97a707b7af1
我发现找不到 gpt-5.5 好像是开启
fast导致的当然这也解释不了为什么上下文丢失