# o1-2024-12-17

Calls to the model o1-2024-12-17 on OpenAI stopped working on October 23, 2026.

On October 23, 2026, OpenAI retired model o1-2024-12-17. Requests that target this snapshot fail since that date. The change affects any API calls still specifying model o1-2024-12-17.

## The error OpenAI returns once o1-2024-12-17 is gone

HTTP 404

```json
{"error":{"message":"The model `o1-2024-12-17` 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 the recommended substitute model, gpt-5.6-sol.

- API: OpenAI (api.openai.com)
- Model: o1-2024-12-17
- Kind: Model retirement
- Takes effect: October 23, 2026
- Calls after that day: fail
- Calls it hits: `model o1-2024-12-17`
- 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/o1-2024-12-17/

## OpenAI's words

> Shutdown date: October 23, 2026; Model snapshot: o1-2024-12-17 | o1; Substitute model: gpt-5.6-sol

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