OpenAI
gpt-5.1-codex model retirement
Stopped workingSubscribe to OpenAIShare
Calls to the model gpt-5.1-codex on OpenAI stopped working on July 23, 2026.
The error you get
What OpenAI answers a call to gpt-5.1-codex once the model is gone, as recorded from real responses:
{"error":{"message":"The model `gpt-5.1-codex` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations","type":"invalid_request_error","param":null,"code":"model_not_found"}}What to use instead of gpt-5.1-codex
Move to gpt-5.6-sol, recommended by OpenAI.
In OpenAI's words
Shutdown date: July 23, 2026; Model snapshot: gpt-5.1-codex; Substitute model: gpt-5.6-sol
Facts
- API
- OpenAI
api.openai.com - Model
gpt-5.1-codex- Released
- November 13, 2025 (models.dev)
- Kind
- Model retirement
- Takes effect
- July 23, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against OpenAI's own pages
Questions
When does gpt-5.1-codex shut down?
Calls to the model gpt-5.1-codex on OpenAI stopped working on July 23, 2026.
What happens to calls after July 23, 2026?
They have failed since July 23, 2026.
What error does gpt-5.1-codex return once it is shut down?
OpenAI answers HTTP 404: "The model `gpt-5.1-codex` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was gpt-5.1-codex released?
gpt-5.1-codex was released on November 13, 2025, according to models.dev.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
gpt-5.1-codex on other APIs 1
-
Azure AI Foundry
gpt-5.1-codexModel retirement Stops workingin 190 days
More from OpenAI 10
-
computer-use-previewModel retirement Stopped working -
computer-use-preview-2025-03-11Model retirement Stopped working -
gpt-4o-mini-search-previewModel retirement Stopped working -
gpt-4o-mini-search-preview-2025-03-11Model retirement Stopped working -
gpt-4o-search-previewModel retirement Stopped working -
gpt-4o-search-preview-2025-03-11Model retirement Stopped working -
gpt-5-chat-latestModel retirement Stopped working -
gpt-5-codexModel retirement Stopped working -
gpt-5.1-chat-latestModel retirement Stopped working -
gpt-5.1-codex-maxModel retirement Stopped working
You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.