# o1 Preview spotted on Arena

o1 Preview is a model from OpenAI, released on 12 Sep 2024. First seen 11 Sep 2026. Catalogues list a 128,000 tokens context window. 3 evidence links.

- Kind: Sighting
- Developer: OpenAI
- Confidence: Supported
- First seen: 2026-09-11T21:39:38.120Z
- Model: [o1 Preview](https://alexgetman.com/models/openai/o1-preview/)
- Canonical: https://alexgetman.com/signals/2026/09/11/o1-preview/

## Evidence links

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