Codex CLI prompts API users to break their config (to use an unsupported model)

Resolved 💬 6 comments Opened Feb 11, 2026 by lattwood Closed Feb 13, 2026

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

What version of Codex CLI is running?

0.0.0/main

What subscription do you have?

API

Which model were you using?

gpt-5.2-codex

What platform is your computer?

_No response_

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

_No response_

What issue are you seeing?

When starting codex cli after ya'll released gpt-5.3-codex, it prompts the user to change models!

  Codex just got an upgrade. Introducing gpt-5.3-codex.

  Codex is now powered by gpt-5.3-codex, our most capable agentic coding model yet. It's built for long-running, project-scale work, with mid-turn steering + frequent progress updates so you can collaborate while it runs (and it's faster too).

  Learn more: https://openai.com/index/introducing-gpt-5-3-codex/

  You can keep using gpt-5.2-codex if you prefer.

  Choose how you'd like Codex to proceed.

› 1. Try new model
  2. Use existing model

  Use ↑/↓ to move, press enter to confirm

If you hit enter and then try to use Codex?

■ stream disconnected before completion: The model `gpt-5.3-codex` does not exist or you do not have access to it.

What steps can reproduce the bug?

Set it up for api key auth. Set the model to gpt-5.2-codex. Run codex and when it asks if you want to try gpt-5.3-codex, respond in the affirmative.

What is the expected behavior?

Don't ask the user to change the configuration to something that ultimately breaks the product, given the authentication mechanism in use.

Don't give the user false hope they don't have to wait a few weeks for it to be available via API.

Additional information

Looks like when gpt-5.3-codex was added, supported_in_api was false, but latest main has supported_in_api is now true, in models.json.

View original on GitHub ↗

6 Comments

narengogi · 5 months ago

you I'm getting the following error
The model gpt-5.3-codex does not exist or you do not have access to it.
I'm using it through an AI gateay (portkey) but I dont think that is relevant, my org has been consistently billing > $5000 a month so I'm pretty sure I'm on a good tier

etraut-openai contributor · 5 months ago

@narengogi, that's not related to this issue. Please use the /feedback slash command to upload your logs and open a new issue that includes the thread ID and supplies the other details requested in the bug report template.

etraut-openai contributor · 5 months ago

@lattwood, thanks for the bug report. This will be fixed in the next release.

MauScheff · 5 months ago

Same here, uploaded the logs: 019c6806-3c0b-7192-9f70-ee92475ca10e
If I do /model though, it doesn't show gpt-5.3-codex but it seems trying to use it, since I accepted to try the new model.
I switched back to gpt-5.2-codex and that one works.

iHateThisGameSo · 5 months ago

Same here today, can use it

vladimirsvicevicsrb · 4 months ago

Any solution to this? Having the same issue with gpt5.3 codex