OpenAI
ft-gpt-4.1-nano model retirement
Stopped workingSubscribe to OpenAIShare
On October 23, 2026, the model ft-gpt-4.1-nano was retired. API requests targeting ft-gpt-4.1-nano fail since that day. Update any configurations or workflows that still reference this model.
The error you get
What OpenAI answers a call to ft-gpt-4.1-nano once the model is gone, as recorded from real responses:
{"error":{"message":"The model `ft-gpt-4.1-nano` 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 ft-gpt-4.1-nano
Move to gpt-5.6-luna, recommended by OpenAI.
Facts
- API
- OpenAI
api.openai.com - Model
ft-gpt-4.1-nano- 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 ft-gpt-4.1-nano shut down?
Calls to the model ft-gpt-4.1-nano 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 ft-gpt-4.1-nano return once it is shut down?
OpenAI answers HTTP 404: "The model `ft-gpt-4.1-nano` 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.