# ft-gpt-4.1-nano

Calls to the model ft-gpt-4.1-nano on OpenAI stopped working on October 23, 2026.

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 OpenAI returns once ft-gpt-4.1-nano is gone

HTTP 404

```json
{"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

Move to gpt-5.6-luna, recommended by OpenAI.

- API: OpenAI (api.openai.com)
- Model: ft-gpt-4.1-nano
- Kind: Model retirement
- Takes effect: October 23, 2026
- Calls after that day: fail
- Calls it hits: `model ft-gpt-4.1-nano`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Verified: November 6, 2026, against OpenAI's own pages
- Page: https://www.okapi.bot/models/openai/ft-gpt-4.1-nano/

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent