gpt-5.3-codex model not supported in Codex CLI when authenticated with ChatGPT Plus

[pavelbe]

What version of Codex CLI is running?

codex-cli 0.114.0

What subscription do you have?

ChatGPT Plus

Which model were you using?

gpt-5.4 (previously working), currently falling back to gpt-5.2

What platform is your computer?

Windows 11 with WSL2 (Ubuntu)

What terminal emulator and version are you using (if applicable)?

Windows Terminal running WSL Ubuntu

What issue are you seeing?

When using Codex CLI with a ChatGPT Plus account, the CLI returns the following error:

"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."

Environment:

• Codex CLI version: 0.114.0
• OS: Windows 11 with WSL2 (Ubuntu)
• Authentication: ChatGPT account login
• Plan: ChatGPT Plus

Important context:
The model gpt-5.4 worked correctly until yesterday with the same setup.
Today the CLI started returning the error above and appears to route requests to gpt-5.3-codex which is not supported for ChatGPT accounts.

As a workaround I had to switch to gpt-5.2 to continue using Codex CLI.

What steps can reproduce the bug?

1. Install Codex CLI
2. Login using ChatGPT account authentication
3. Run Codex CLI normally
4. The CLI attempts to use gpt-5.3-codex
5. The CLI returns the error:

"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."

Uploaded thread:
019cf02c-4f18-78c0-817a-3db5c82ed772

What is the expected behavior?

Codex CLI should either:

1. Allow the gpt-5.3-codex model when using a ChatGPT Plus account, or
2. Automatically select a supported default model instead of failing.

Previously gpt-5.4 worked correctly with the same setup.

Additional information

I noticed that multiple GitHub issues report the same error and were closed as duplicates (for example #14306 referencing #14331).
However the issue still occurs in Codex CLI version 0.114.0.

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• {"detail":"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."} #14306
• gpt-5.4 and gpt-5.3-codex unavailable via Codex extention on VSC and Codex App when using ChatGPT account #14412
• Codex 5.4 / 5.3-codex models fail with “not supported for ChatGPT account” error #14190
• The ('gpt-5.4', 'gpt-5.3-codex') model is not supported when using Codex with a ChatGPT account. #14181
• The GPT-5.3-Codex model does NOT WORK in PAID ACCOUNT #14331

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[etraut-openai]

Please refer to this comment.

[Gieted]

@etraut-openai I'm having the same issue, despite having a Plus subscription, I cannot use gpt-5.4 nor gpt-5.3-codex inside Codex CLI or Codex desktop app.

[talhaayyubi]

@etraut-openai I'm having the same issue as reported above. I'm on a paid Plus plan but can't access gpt-5.4. It keeps falling back to gpt-5.2 or gpt-5 codex based agent. I followed the steps you suggested in your comment on #14331 . Logged out and logged back in, deleted the models cache file, and relaunched. First tried this on the CLI (0.114.0), then upgraded to 0.115.0, and subsequently tried the Codex macOS desktop app as well. No success, still the same result across all of them.