# OpenAI o1-preview — deprecation status

> Yes — o1-preview is retired. OpenAI deprecated it on April 28, 2025 and shut it down on July 28, 2025; API requests to it now fail. The recommended replacement is o3.

The first public reasoning model, released as a preview in September 2024 and retired ten months later — the shortest life of any widely adopted OpenAI model. It hid its reasoning tokens but billed for them, which is where the industry-wide argument about reasoning-token pricing started.

## Facts

| Field | Value |
| --- | --- |
| Provider | OpenAI |
| Model id | `o1-preview` |
| Status | Retired |
| Released | September 12, 2024 |
| Deprecated | April 28, 2025 |
| Shutdown | July 28, 2025 (367 days ago) |
| Last verified | July 30, 2026 |

## Replacement

- **o3** (`o3`) · recommended — https://modeldeprecations.dev/openai/o3
  - OpenAI named o3 as the successor; o3 is itself now deprecated with a December 2026 shutdown, so the durable target is gpt-5.6-sol.
  - Parameters it accepts: https://modelparams.dev/models/openai/o3

```diff
- "model": "o1-preview"
+ "model": "o3"
```

## FAQ

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

OpenAI o1-preview shut down on July 28, 2025. API requests to it fail from that date onward.

### What replaces OpenAI o1-preview?

OpenAI recommends o3 (`o3`) as the replacement for OpenAI o1-preview. OpenAI named o3 as the successor; o3 is itself now deprecated with a December 2026 shutdown, so the durable target is gpt-5.6-sol.

### Is OpenAI o1-preview still available?

No. OpenAI o1-preview is retired and no longer served — it was shut down on July 28, 2025. Calls to it return an error.

### How do I migrate from OpenAI o1-preview to o3?

Swap the model id in your API call: replace "o1-preview" with "o3". OpenAI named o3 as the successor; o3 is itself now deprecated with a December 2026 shutdown, so the durable target is gpt-5.6-sol.

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