OpenAI
gpt-4.1-nano model retirement
Stopped workingSubscribe to OpenAIShare
On October 23, 2026, the model gpt-4.1-nano was shut down. Calls specifying model gpt-4.1-nano fail since that day. This retirement also covers the gpt-4.1-nano-2025-04-14 snapshot.
The error you get
What OpenAI answers a call to gpt-4.1-nano once the model is gone, as recorded from real responses:
{"error":{"message":"The model `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 gpt-4.1-nano
Move to gpt-5.6-luna, which is the substitute model recommended by OpenAI.
In OpenAI's words
Shutdown date: October 23, 2026; Model snapshot: gpt-4.1-nano | gpt-4.1-nano-2025-04-14; Substitute model: gpt-5.6-luna
Facts
- API
- OpenAI
api.openai.com - Model
gpt-4.1-nano- Released
- April 14, 2025 (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 gpt-4.1-nano shut down?
Calls to the model 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 gpt-4.1-nano return once it is shut down?
OpenAI answers HTTP 404: "The model `gpt-4.1-nano` has been deprecated, learn more here: https://platform.openai.com/docs/deprecations". Send another model to fix it.
When was gpt-4.1-nano released?
gpt-4.1-nano was released on April 14, 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.
gpt-4.1-nano on other APIs 2
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Azure AI Foundry
gpt-4.1-nanoModel retirement Stops workingin 159 days -
Azure OpenAI
gpt-4.1-nanoModel retirement Stops workingin 342 days
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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.