# o3-2025-04-16

Calls to the model o3-2025-04-16 on OpenAI stop working on December 11, 2026.

On December 11, 2026, the model o3-2025-04-16 will be retired. Calls targeting this model after this date will fail. This change shuts down access to the snapshot entirely.

## The error OpenAI returns once o3-2025-04-16 is gone

HTTP 404

```json
{"error":{"message":"The model `o3-2025-04-16` 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.

- API: OpenAI (api.openai.com)
- Model: o3-2025-04-16
- Kind: Model retirement
- Takes effect: December 11, 2026
- Calls after that day: fail
- Calls it hits: `model o3-2025-04-16`
- 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/o3-2025-04-16/

## 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