gpt-5.4 and gpt-5.3-codex unavailable via Codex extention on VSC and Codex App when using ChatGPT account
What issue are you seeing?
As of March 10, 2026, the models gpt-5.4 and gpt-5.3-codex are no longer accessible when using Codex with a ChatGPT account.
When selecting either model in Codex App or the VSCode Codex extension and sending a prompt, the request fails with the following error:
{"detail":"The 'gpt-5.4' model is not supported when using Codex with a ChatGPT account."}
The same behavior occurs with gpt-5.3-codex.
These models were confirmed working on March 9. Older models such as gpt-5.2 still function normally.
The issue has been reported by multiple users across Free and Business plans, suggesting a possible backend regression or access policy change.
<img width="1033" height="271" alt="Image" src="https://github.com/user-attachments/assets/bc1270e7-3c96-469d-90c4-7199464fdcad" />
What steps can reproduce the bug?
- Open Codex App or VSCode with the Codex extension installed.
- Log in using a ChatGPT account.
- Select the model "gpt-5.4" or "gpt-5.3-codex".
- Send any prompt.
Result:
The request fails with the error:
{"detail":"The 'gpt-5.4' model is not supported when using Codex with a ChatGPT account."}
Note:
Older models such as gpt-5.2 continue to work normally.
What is the expected behavior?
_No response_
Additional information
_No response_
8 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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Are you using a free plan, or a paid plan? If free, then this is expected. See #14181 for details.
If you are using a paid plan, then this is not expected. We've had a few reports of this from other users, but we're looking for additional clues that might explain the problem. If you're on a paid plan, please use the
/feedbackslash command to upload your logs and post the thread ID below so we can investigate.Just resolved this on my end. Turned out my ChatGPT Plus subscription had expired — the error disappeared immediately after I renewed it.
If you're seeing this error, check your subscription status first. When the subscription lapses, the OAuth token loses access to gpt-5.4 and gpt-5.3-codex, but gpt-5.2 still works (likely available on Free tier). The error message doesn't mention subscription at all, which makes it very misleading.
This may not be the cause for everyone, but worth checking before assuming it's a backend regression.
then why this error? it must be handled...
it's a pity this restriction for free users wasn't communicated better and openly, it was buried in a comment on a buried issue
I experienced the same issue with Codex in VS Code despite having a ChatGPT Plus subscription. Restarting the installed Codex extension resolved the problem, and both GPT-5.3 and GPT-5.4 are now available.
I am experiencing this issue on my Plus plan using codex macos app. 5.4 works, but when i try to select 5.5 i get
I'm having the same issue. The new Sol, Terra, and Luna models are also not appearing. I reinstalled the extension and I am certain my plan hasn't expired.