The command `codex --yolo -m gpt-5.1-codex-max` unable to use gpt-5.1-codex-max model.

Resolved 💬 3 comments Opened Nov 20, 2025 by doggy8088 Closed Nov 21, 2025

💡 Likely answer: A maintainer (lionel-oai, contributor) responded on this thread — see the highlighted reply below.

What version of Codex is running?

codex-cli 0.61.0

What subscription do you have?

ChatGPT Plus

Which model were you using?

gpt-5.1-codex-max

What platform is your computer?

Windows

What issue are you seeing?

I can't use the model.

unexpected status 400 Bad Request: {
  "error": {
    "message": "The requested model 'gpt-5.1-codex-max' does not exist.",
    "type": "invalid_request_error",
    "param": "model",
    "code": "model_not_found"
  }

What steps can reproduce the bug?

Uploaded thread: 019aa288-e230-7441-943d-109dbe675f0d

What is the expected behavior?

I expected to use this model.

Additional information

_No response_

View original on GitHub ↗

3 Comments

lionel-oai contributor · 9 months ago

Hi @doggy8088 just tried on a sample repository with the same cli version and it worked:

https://github.com/user-attachments/assets/f1db5ef0-c46f-4d5f-8421-2543dc9d085a

Could you share your config.toml? It might be that you have switched to an API key usage and the model is not yet available in the API

oasaleh · 9 months ago

Yep.. You can use it in the CLI if you use your subscription. But not using the API.

doggy8088 · 9 months ago

It works now after I codex login again.