OpenAI
o4-mini-deep-research model retirement
Stopped workingSubscribe to OpenAIShare
On July 23, 2026, the o4-mini-deep-research model was retired. Calls targeting model o4-mini-deep-research fail since that day. This shutdown also affected the model snapshot o4-mini-deep-research-2025-06-26.
The error you get
What OpenAI answers a call to o4-mini-deep-research once the model is gone, as recorded from real responses:
{"error":{"message":"The model `o4-mini-deep-research` 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 o4-mini-deep-research
Move to the substitute model gpt-5.6-sol, which OpenAI recommends.
In OpenAI's words
Shutdown date: July 23, 2026; Model snapshot: o4-mini-deep-research-2025-06-26 | o4-mini-deep-research; Substitute model: gpt-5.6-sol
Facts
- API
- OpenAI
api.openai.com - Model
o4-mini-deep-research- Released
- June 26, 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 o4-mini-deep-research shut down?
Calls to the model o4-mini-deep-research 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 o4-mini-deep-research return once it is shut down?
OpenAI answers HTTP 404: "The model `o4-mini-deep-research` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was o4-mini-deep-research released?
o4-mini-deep-research was released on June 26, 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.