OpenAI
o3 model retirement
Stops workingSubscribe to OpenAIShare
On December 11, 2026, the model o3 will shut down. Requests sent to this model will fail after this date. This retirement affects all API calls specifying model o3.
The error you get from December 11, 2026
What OpenAI answers a call to o3 once the model is gone, as recorded from real responses:
{"error":{"message":"The model `o3` 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 o3
Move to gpt-5.6-sol, which is recommended by OpenAI as the replacement.
In OpenAI's words
Shutdown date: Dec 11, 2026; Model / system: o3 | o3-2025-04-16; Recommended replacement: gpt-5.6-sol
Facts
- API
- OpenAI
api.openai.com - Model
o3- Released
- April 16, 2025 (models.dev)
- Kind
- Model retirement
- Takes effect
- December 11, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against OpenAI's own pages
Questions
When does o3 shut down?
Calls to the model o3 on OpenAI stop working on December 11, 2026.
What happens to calls after December 11, 2026?
They fail from that day.
What error does o3 return once it is shut down?
OpenAI answers HTTP 404: "The model `o3` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was o3 released?
o3 was released on April 16, 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.
o3 on other APIs 1
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Azure AI Foundry
o3Model retirement Stops workingin 13 days
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Is your code calling this?
Okapi finds the calls this change hits in your repo and opens the pull request with the fix before December 11, 2026.