OpenAI
o1-preview model retirement
Stopped workingSubscribe to OpenAIShare
Calls to the model o1-preview on OpenAI stopped working on July 28, 2025.
The error you get
What OpenAI answers a call to o1-preview once the model is gone, as recorded from real responses:
{"error":{"message":"The model `o1-preview` 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-preview
Move to gpt-5.6-sol. o3, named first, stops working on 2026-12-11.
In OpenAI's words
Shutdown date: 2025-07-28; Model / system: o1-preview; Recommended replacement: o3
Facts
- API
- OpenAI
api.openai.com - Model
o1-preview- Kind
- Model retirement
- Takes effect
- July 28, 2025
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against OpenAI's own pages
Questions
When does o1-preview shut down?
Calls to the model o1-preview on OpenAI stopped working on July 28, 2025.
What happens to calls after July 28, 2025?
They have failed since July 28, 2025.
What error does o1-preview return once it is shut down?
OpenAI answers HTTP 404: "The model `o1-preview` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
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.