# o3-deep-research

Calls to the model o3-deep-research on OpenAI stopped working on July 23, 2026.

On July 23, 2026, the model o3-deep-research reached its shutdown date. Requests targeting model o3-deep-research fail since that day.

## The error OpenAI returns once o3-deep-research is gone

HTTP 404

```json
{"error":{"message":"The model `o3-deep-research` 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 OpenAI recommends as the substitute model.

- API: OpenAI (api.openai.com)
- Model: o3-deep-research
- Released: June 26, 2025 (models.dev)
- Kind: Model retirement
- Takes effect: July 23, 2026
- Calls after that day: fail
- Calls it hits: `model o3-deep-research`
- 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-deep-research/

## OpenAI's words

> Shutdown date: July 23, 2026; Model snapshot: o3-deep-research-2025-06-26 | o3-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