# o4-mini-deep-research-2025-06-26

Calls to the model o4-mini-deep-research-2025-06-26 on OpenAI stopped working on July 23, 2026.

On July 23, 2026, OpenAI retired model snapshot o4-mini-deep-research-2025-06-26. Any API requests targeting model o4-mini-deep-research-2025-06-26 fail since that date.

## The error OpenAI returns once o4-mini-deep-research-2025-06-26 is gone

HTTP 404

```json
{"error":{"message":"The model `o4-mini-deep-research-2025-06-26` 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: o4-mini-deep-research-2025-06-26
- Kind: Model retirement
- Takes effect: July 23, 2026
- Calls after that day: fail
- Calls it hits: `model o4-mini-deep-research-2025-06-26`
- 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/o4-mini-deep-research-2025-06-26/

## OpenAI's words

> Shutdown date: July 23, 2026; Model snapshot: o4-mini-deep-research-2025-06-26 | o4-mini-deep-research; 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