# o1-preview

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

## The error OpenAI returns once o1-preview is gone

HTTP 404

```json
{"error":{"message":"The model `o1-preview` 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-sol. o3, named first, stops working on 2026-12-11.

- 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)
- Verified: November 6, 2026, against OpenAI's own pages
- Page: https://www.okapi.bot/models/openai/o1-preview/

## OpenAI's words

> Shutdown date: 2025-07-28; Model / system: o1-preview; Recommended replacement: o3

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