# o1 Preview

o1 Preview is a model from OpenAI, released on 12 Sep 2024. The context window is 128,000 tokens. The maximum output is 32,768 tokens.

- Developer: OpenAI
- Id: o1-preview
- Released: 2024-09-12T00:00:00.000Z
- Sighting: 2026-10-07T19:47:12.328Z
  - [evidence link](https://developers.openai.com/api/docs/models/o1-preview)
- Status: Released
- API availability: 2024-09-12
  - [evidence link](https://developers.openai.com/api/docs/changelog)
- Canonical: https://alexgetman.com/models/openai/o1-preview/

## Questions

### What is the context window of o1 Preview?

The context window is 128,000 tokens. The maximum output is 32,768 tokens.

### When was o1 Preview released?

On 12 Sep 2024.

## Evidence links

- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [openai-api-changelog](https://developers.openai.com/api/docs/changelog)
- [review](https://developers.openai.com/api/docs/models/o1-preview)
- [Arena · leaderboards](https://platform.openai.com/docs/models/o1)

## Signals

- [o1 Preview spotted on Arena](https://alexgetman.com/signals/2026/09/11/o1-preview/)