OpenAI
gpt-5.1-codex-max model retirement
Stopped workingSubscribe to OpenAIShare
The model gpt-5.1-codex-max was retired on July 23, 2026. Calls specifying model gpt-5.1-codex-max fail since that date.
The error you get
What OpenAI answers a call to gpt-5.1-codex-max once the model is gone, as recorded from real responses:
{"error":{"message":"The model `gpt-5.1-codex-max` 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-max
Move to gpt-5.6-sol, which is recommended by OpenAI as the replacement.
In OpenAI's words
Shutdown date: July 23, 2026; Model snapshot: gpt-5.1-codex-max; Substitute model: gpt-5.6-sol
Facts
- API
- OpenAI
api.openai.com - Model
gpt-5.1-codex-max- 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-max shut down?
Calls to the model gpt-5.1-codex-max 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-max return once it is shut down?
OpenAI answers HTTP 404: "The model `gpt-5.1-codex-max` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was gpt-5.1-codex-max released?
gpt-5.1-codex-max 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-max on other APIs 2
-
Azure AI Foundry
gpt-5.1-codex-maxModel retirement Stops workingin 193 days -
No date
DigitalOcean API
GPT-5.1-Codex-MaxModel retirement Deprecated, no date
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.