Codex models are no longer supported with a ChatGPT account
Resolved 💬 2 comments Opened Jun 3, 2026 by sheabrewer1986 Closed Jun 3, 2026
💡 Likely answer: A maintainer (etraut-openai, contributor)
responded on this thread — see the highlighted reply below.
I have been using Codex on my Mac with Xcode for quite some time but only yesterday I started getting the error as such:
Codex encountered an error: {"detail":"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."}
This error seems to occur regardless of which version of Codex I select (5.2, 5.3, 5.4)
I am a ChatGPT Plus subscriber.
Is this a bug? Or is Codex no longer working at all for ChatGPT account holders regardless of tier?
If so, what are alternatives to getting Codex working again inside Xcode?
2 Comments
The gpt-5.2 and gpt-5.3-codex models have been retired. Switch to one of the newer models like 5.4 or 5.5.
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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