# o1

Calls to the model o1 on OpenAI stop working on October 23, 2026.

On October 23, 2026, the model o1 will be retired. Requests that target model o1 will fail after this date. Update any systems sending traffic to this identifier before the shutdown day.

- API: OpenAI (api.openai.com)
- Model: o1
- Kind: Model retirement
- Takes effect: October 23, 2026
- Calls after that day: fail
- Calls it hits: `model o1`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Page: https://www.okapi.bot/models/openai/o1/

## What to use instead

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