404 Not Found: Model not found gpt-5.4

What version of Codex CLI is running?

v0.122.0

What subscription do you have?

ChatGPT Pro

Which model were you using?

gpt-5.4

What platform is your computer?

Darwin 25.3.0 arm64 arm

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

Ghostty

What issue are you seeing?

When sending message to the chat

unexpected status 404 Not Found: Model not found gpt-5.4, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: 9ef8d6c30b311739-SJC, request id: 2dcc071e-dcc6-44d1-b6d6-29f776ce5b7d

<img width="2125" height="437" alt="Image" src="https://github.com/user-attachments/assets/d7ff3c9e-6c77-488a-9990-4ee43cb9ed64" />

What steps can reproduce the bug?

• Open codex
• Input hi

What is the expected behavior?

Codex responds without error

Additional information

_No response_