GPT-5.3-Codex is listed in Plus Codex pricing/docs but unavailable in Codex CLI with ChatGPT login

What version of Codex CLI is running?

codex-cli 0.137.0

What subscription do you have?

Plus

Which model were you using?

gpt-5.3-codex

What platform is your computer?

Darwin 24.6.0 arm64 arm

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

iTerm2

Codex doctor report

What issue are you seeing?

I have an active ChatGPT Plus subscription and I am signed into Codex CLI using the documented browser / ChatGPT account login flow.

According to the official Codex pricing page, Codex is included in ChatGPT plans, including Plus. The Plus section says it includes Codex in the CLI and lists “the latest models, including GPT-5.5, GPT-5.4, and GPT-5.3-Codex”.

Pricing page:
https://developers.openai.com/codex/pricing?codex-usage-limits=plus

However, in my Codex CLI session signed in with my ChatGPT Plus account:

• gpt-5.3-codex is not shown in /model
• invoking it directly fails with:

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

What steps can reproduce the bug?

1. Install or update Codex CLI.
2. Sign in using the browser / ChatGPT account login flow.
3. Use an active ChatGPT Plus account.
4. Start Codex CLI.
5. Run /model.
6. Observe that gpt-5.3-codex is not listed.
7. Try to invoke the model directly:

codex -m gpt-5.3-codex

1. Observe the error:

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

What is the expected behavior?

_No response_

Additional information

_No response_