# O3 Mini spotted on Arena

O3 Mini is a model from OpenAI, released on 31 Jan 2025. First seen 11 Sep 2026. Catalogues list a 200,000 tokens context window. 11 evidence links.

- Kind: Sighting
- Developer: OpenAI
- Confidence: Confirmed
- First seen: 2026-09-11T21:39:38.120Z
- Model: [O3 Mini](https://alexgetman.com/models/openai/o3-mini/)
- Canonical: https://alexgetman.com/signals/2026/09/11/o3-mini-high/

## Evidence links

- [Arena · leaderboards](https://platform.openai.com/docs/guides/reasoning#reasoning-effort)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)
- [OpenCode · discovery](https://opencode.ai/data/openai/o3-mini)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [OpenAI · pricing](https://developers.openai.com/api/docs/pricing)
- [OpenAI · model index](https://developers.openai.com/api/docs/models/o3-mini)
- [OpenRouter](https://openrouter.ai/openai/o3-mini)
- [OpenRouter](https://openrouter.ai/openai/o3-mini-high)
- [models.dev · catalogue](https://models.dev/#o3-mini)
- [models.dev · catalogue](https://models.dev/#o3-mini-high)
- [OpenAI · deprecations](https://platform.openai.com/docs/deprecations)