# gpt-5.1

Calls to the model gpt-5.1 on OpenAI stop working on April 1, 2027.

- API: OpenAI (api.openai.com)
- Model: gpt-5.1
- Kind: Model retirement
- Takes effect: April 1, 2027
- Calls after that day: fail
- Calls it hits: `model gpt-5.1`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Page: https://www.okapi.bot/models/openai/gpt-5.1/

## What to use instead

Move to gpt-6-sol, recommended by OpenAI.