OpenAI
o1-mini model retirement
Stopped workingSubscribe to OpenAIShare
Calls to the model o1-mini on OpenAI stopped working on October 27, 2025.
The error you get
What OpenAI answers a call to o1-mini once the model is gone, as recorded from real responses:
{"error":{"message":"The model `o1-mini` 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 o1-mini
Move to gpt-5.6-terra. o4-mini, named first, stopped working on 2026-10-23.
In OpenAI's words
Shutdown date: 2025-10-27; Model / system: o1-mini; Recommended replacement: o4-mini
Facts
- API
- OpenAI
api.openai.com - Model
o1-mini- Released
- January 1, 2025 (models.dev)
- Kind
- Model retirement
- Takes effect
- October 27, 2025
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against OpenAI's own pages
Questions
When does o1-mini shut down?
Calls to the model o1-mini on OpenAI stopped working on October 27, 2025.
What happens to calls after October 27, 2025?
They have failed since October 27, 2025.
What error does o1-mini return once it is shut down?
OpenAI answers HTTP 404: "The model `o1-mini` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was o1-mini released?
o1-mini was released on January 1, 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.
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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.