Error Message "'gpt-5.3-codex' model is not supported" in VS Code Extension
Resolved 💬 6 comments Opened Mar 10, 2026 by dartrax Closed Mar 10, 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?
VS Code newest Version
What subscription do you have?
Free
Which IDE are you using?
VS Code
What platform is your computer?
Win 10
What issue are you seeing?
The following Error Message appears:
{"detail":"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."}
What steps can reproduce the bug?
It appears with any prompt in Codex Chat Window.
What is the expected behavior?
_No response_
Additional information
_No response_
6 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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@ethersmith-ai What is the solution, can you provide a direct link or quote to the solution in the duplicate?
Just edit the config.toml file of codex and add this in the first line:
model = "gpt-5.2-codex"This is not a solution. As a paid user I want to use 5.3-codex.
Why are all the tickets being closed with no solution?
Well, I'm afraid to tell you that according OpenAI, we are not paying enough to be able to use that model.
Because dealing with comments like yours is tiring and brings zero value.
According to OpenAI's codex pricing page Plus plan includes 5.3-codex and 5.4