unexpected status 404 Not Found: Model not found gpt-5.4

Resolved 💬 8 comments Opened Apr 21, 2026 by kirso Closed Apr 26, 2026

💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

What version of Codex CLI is running?

0.122.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.4. high

What platform is your computer?

Darwin 25.4.0 arm64 arm

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

Warp & Ghostty

What issue are you seeing?

Falling back from WebSockets to HTTPS transport. unexpected status 404 Not Found: Model not
  found gpt-5.4-c

■ unexpected status 404 Not Found: Model not found gpt-5.4, url:
https://chatgpt.com/backend-api/codex/responses, cf-ray: 9ef8d8440c2ca6d7-CGK, request id: 0
45c691a-4a1d-4f38-9568-5e2c81c9d8f6

What steps can reproduce the bug?

Uploaded thread: 019da9df-8c79-7141-89f4-e8307dcc1d8d

What is the expected behavior?

Codex initialises and doesn't get stuck on the bug

Additional information

_No response_

View original on GitHub ↗

8 Comments

github-actions[bot] contributor · 3 months ago

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

#18791
#18788
#18790

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etraut-openai contributor · 2 months ago

I think this was due to a temporary glitch as we were preparing to roll out gpt-5.5. Should be fixed now.

Ayandadlamini12 · 1 month ago

unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: a080a2856, request id: 3-d

Hemantabhusal · 1 month ago

unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: a08154cc6cd1c6af

manojkumarfade · 1 month ago

Error running remote compact task: unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses/compact

How to solve this? Anyone?

Hemantabhusal · 1 month ago

Error running remote compact task: unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses/compact How to solve this? Anyone?

Just wait for openai devloper to fix the issue !!

bestdmp · 1 month ago

same 👎 unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: a082a5594b412535-GRU, request id: 64132194-d78f-4665-b1bf-a85ae894132a

etraut-openai contributor · 1 month ago

Please don't post to closed issues. If you're seeing a problem with similar symptoms, please open a new issue and use /feedback to upload logs.