# OpenAI o4-mini-deep-research — deprecation status

> Yes — o4-mini-deep-research is retired. OpenAI deprecated it on April 22, 2026 and shut it down on July 23, 2026; API requests to it now fail. The recommended replacement is GPT-5.6 Sol.

The cheaper deep-research model, sized for research loops run at volume rather than one report at a time. Retired July 23, 2026 alongside o3-deep-research.

## Facts

| Field | Value |
| --- | --- |
| Provider | OpenAI |
| Model id | `o4-mini-deep-research` |
| Status | Retired |
| Aliases | `o4-mini-deep-research-2025-06-26` |
| Released | June 26, 2025 |
| Deprecated | April 22, 2026 |
| Shutdown | July 23, 2026 (7 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **GPT-5.6 Sol** (`gpt-5.6-sol`) · recommended — https://modeldeprecations.dev/openai/gpt-5.6-sol
  - No deep-research id exists in the current generation. Expect to rebuild the search-and-summarise loop in application code.
  - Parameters it accepts: https://modelparams.dev/models/openai/gpt-5.6-sol

```diff
- "model": "o4-mini-deep-research"
+ "model": "gpt-5.6-sol"
```

## FAQ

### When did OpenAI o4-mini-deep-research shut down?

OpenAI o4-mini-deep-research shut down on July 23, 2026. API requests to it fail from that date onward.

### What replaces OpenAI o4-mini-deep-research?

OpenAI recommends GPT-5.6 Sol (`gpt-5.6-sol`) as the replacement for OpenAI o4-mini-deep-research. No deep-research id exists in the current generation. Expect to rebuild the search-and-summarise loop in application code.

### Is OpenAI o4-mini-deep-research still available?

No. OpenAI o4-mini-deep-research is retired and no longer served — it was shut down on July 23, 2026. Calls to it return an error.

### How do I migrate from OpenAI o4-mini-deep-research to gpt-5.6-sol?

Swap the model id in your API call: replace "o4-mini-deep-research" with "gpt-5.6-sol". No deep-research id exists in the current generation. Expect to rebuild the search-and-summarise loop in application code.

### Does this apply to o4-mini-deep-research-2025-06-26 too?

Yes. OpenAI o4-mini-deep-research is also published as `o4-mini-deep-research-2025-06-26`; that id shares the same lifecycle dates as `o4-mini-deep-research`.

## Sources

- [OpenAI API deprecations](https://developers.openai.com/api/docs/deprecations) — accessed 2026-07-30

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Canonical page: https://modeldeprecations.dev/openai/o4-mini-deep-research
JSON: https://modeldeprecations.dev/api/v1/models/openai/o4-mini-deep-research.json