# o3

Calls to the model o3 on OpenAI stop working on December 11, 2026.

On December 11, 2026, the model o3 will shut down. Requests sent to this model will fail after this date. This retirement affects all API calls specifying model o3.

## The error OpenAI returns once o3 is gone

HTTP 404

```json
{"error":{"message":"The model `o3` 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, which is recommended by OpenAI as the replacement.

- API: OpenAI (api.openai.com)
- Model: o3
- Released: April 16, 2025 (models.dev)
- Kind: Model retirement
- Takes effect: December 11, 2026
- Calls after that day: fail
- Calls it hits: `model o3`
- 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/o3/

## OpenAI's words

> Shutdown date: Dec 11, 2026; Model / system: o3 | o3-2025-04-16; Recommended replacement: 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