Cannot use GPT-5.1-codex from latest alpha

I've tried logging out / logging back in. I've got a ChatGPT Pro account ($200/m plan)

@aibrahim-oai referencing https://github.com/openai/codex/pull/6569

Is this not supposed to work just yet?

same bruh im feening

This is the weirdest release yet. No benchmarks, no comparisons, no api access, no codex support, nothing.

I get the feeling and impression that GPT 5.1 was released earlier than originally planned, so now some teams such as Codex are catching up. Looking at the activity there are quite a few changes in implementing GPT 5.1 support, including prompt changes, so I guess they won't open up access until they officially release support for the new models.

@ixel1 that might be the case, but thought I'd bring this up still. Was hoping it works in alpha 9 but does not.

https://github.com/openai/codex/compare/rust-v0.58.0-alpha.9...main

I was actually using codex just fine like an hour ago. I upgraded to the latest version and started to get this error. Downgrading doesn't work now either. Forcing the model back to 5.0-codex doesn't work either.

You CAN use the 5.1 model without the -codex.

@LordMooseFace Yeah, I also observed this as well, although I did notice. I'm not too sure if the /review command purposely forces a different model, but using /review on the codex works, but then messages after it do not. And yes, the normal 5.1 model works fine.

"Yes, you’ll be able to use GPT 5.1 in Codex once the model makes it to API later this week"

https://x.com/embirico/status/1988801666142134497

You will be able to use it later this week.

> "Yes, you’ll be able to use GPT 5.1 in Codex once the model makes it to API later this week" https://x.com/embirico/status/1988801666142134497 You will be able to use it later this week.

I think it might be a bigger problem than that, if you force gpt-5.0-codex you also get
■ unexpected status 400 Bad Request: {"detail":"The 'gpt-5.0-codex' model is not supported when using Codex with a
ChatGPT account."}

See the same thing here but interestingly OpenAI is experiencing some issues so may be related? https://status.openai.com/

I went back to (v0.57.0 - sudo npm install -g @openai/codex@0.57.0)
wiped out the codex config [ -d ~/.codex ] && rm -rf ~/.codex
startup, login again and it's all working again now on -codex models on gpt 5 not 5.1

> > "Yes, you’ll be able to use GPT 5.1 in Codex once the model makes it to API later this week" > > > x.com/embirico/status/1988801666142134497 > You will be able to use it later this week. I think it might be a bigger problem than that, if you force gpt-5.0-codex you also get ■ unexpected status 400 Bad Request: {"detail":"The 'gpt-5.0-codex' model is not supported when using Codex with a ChatGPT account."}

The correct model ID for gpt-5 codex is gpt-5-codex, not gpt-5.0-codex

Seems to be working now in 0.58