The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account.
Resolved 💬 2 comments Opened Jun 2, 2026 by IsfandKhan Closed Jun 2, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of the IDE extension are you using?
26.527.60818
What subscription do you have?
ChatGPT Plus
Which IDE are you using?
VS Code
What platform is your computer?
Darwin 25.5.0 arm64 arm
What issue are you seeing?
Feedback Id: 019e88c0-454c-77f2-a27b-76d39c7661a6
What steps can reproduce the bug?
open codex extension in vscode. The model gpt-5.3-codex is already configured in config.toml. Try to send any message
What is the expected behavior?
That it should work as I am a chatgpt plus user
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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The gpt-5.2 and gpt-5.3-codex models have been retired. Please choose a newer model (gpt-5.4 or gpt-5.5). The gpt-5.3-codex model is still available through the API.