OpenAI
o1 model retirement
Stopped workingSubscribe to OpenAIShare
Model o1 was retired on October 23, 2026. Calls to model o1 fail since that date. The change affects requests using the model o1 snapshot.
The error you get
What OpenAI answers a call to o1 once the model is gone, as recorded from real responses:
{"error":{"message":"The model `o1` 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
Move to gpt-5.6-sol, which OpenAI recommends as the replacement.
In OpenAI's words
Shutdown date: October 23, 2026; Model snapshot: o1-2024-12-17 | o1; Substitute model: gpt-5.6-sol
Facts
- API
- OpenAI
api.openai.com - Model
o1- Released
- December 5, 2024 (models.dev)
- Kind
- Model retirement
- Takes effect
- October 23, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against OpenAI's own pages
Questions
When does o1 shut down?
Calls to the model o1 on OpenAI stopped working on October 23, 2026.
What happens to calls after October 23, 2026?
They have failed since October 23, 2026.
What error does o1 return once it is shut down?
OpenAI answers HTTP 404: "The model `o1` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was o1 released?
o1 was released on December 5, 2024, 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.
o1 on other APIs 2
-
Azure AI Foundry
o1Model retirement Stops workingin 13 days -
No date
Azure OpenAI
o1Model 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.