# o1-preview

Calls to the model o1-preview on OpenAI stopped working on July 28, 2025.

- API: OpenAI (api.openai.com)
- Model: o1-preview
- Kind: Model retirement
- Takes effect: July 28, 2025
- Calls after that day: fail
- Calls it hits: `model o1-preview`
- Source: [Deprecations page](https://developers.openai.com/api/docs/deprecations)
- Page: https://www.okapi.bot/models/openai/o1-preview/

## What to use instead

Move to gpt-5.6-sol. o3, named first, stops working on 2026-12-11.