# OpenAI o1-mini — deprecation status

> Yes — o1-mini is retired. OpenAI deprecated it on April 28, 2025 and shut it down on October 27, 2025; API requests to it now fail. The recommended replacement is o4-mini.

The cheap reasoning model of the first o-series generation, strong on maths and code for its size but noticeably weaker on general knowledge. Retired October 2025.

## Facts

| Field | Value |
| --- | --- |
| Provider | OpenAI |
| Model id | `o1-mini` |
| Status | Retired |
| Released | September 12, 2024 |
| Deprecated | April 28, 2025 |
| Shutdown | October 27, 2025 (276 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **o4-mini** (`o4-mini`) · recommended — https://modeldeprecations.dev/openai/o4-mini
  - o4-mini was the named successor and is now itself deprecated, shutting down October 2026. Two migrations in eighteen months for anyone who followed the advice each time.
  - Parameters it accepts: https://modelparams.dev/models/openai/o4-mini

```diff
- "model": "o1-mini"
+ "model": "o4-mini"
```

## FAQ

### When did OpenAI o1-mini shut down?

OpenAI o1-mini shut down on October 27, 2025. API requests to it fail from that date onward.

### What replaces OpenAI o1-mini?

OpenAI recommends o4-mini (`o4-mini`) as the replacement for OpenAI o1-mini. o4-mini was the named successor and is now itself deprecated, shutting down October 2026. Two migrations in eighteen months for anyone who followed the advice each time.

### Is OpenAI o1-mini still available?

No. OpenAI o1-mini is retired and no longer served — it was shut down on October 27, 2025. Calls to it return an error.

### How do I migrate from OpenAI o1-mini to o4-mini?

Swap the model id in your API call: replace "o1-mini" with "o4-mini". o4-mini was the named successor and is now itself deprecated, shutting down October 2026. Two migrations in eighteen months for anyone who followed the advice each time.

## 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/o1-mini
JSON: https://modeldeprecations.dev/api/v1/models/openai/o1-mini.json