# O1 Pro

O1 Pro is a model from OpenAI, released on 19 Mar 2025. The context window is 200,000 tokens. The maximum output is 100,000 tokens.

- Developer: OpenAI
- Id: o1-pro
- Released: 2025-03-19T00:00:00.000Z
- Sighting: 2026-10-07T16:22:11.205Z
  - [evidence link](https://github.com/truefoundry/models/blob/main/providers/microsoft-foundry/o1-pro.yaml)
- Status: Released
- API availability: 2025-03-19
  - [evidence link](https://developers.openai.com/api/docs/changelog)
- Canonical: https://alexgetman.com/models/openai/o1-pro/

## Questions

### What is the context window of O1 Pro?

The context window is 200,000 tokens. The maximum output is 100,000 tokens.

### When was O1 Pro released?

On 19 Mar 2025.

## 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-pro)
- [OpenAI · pricing](https://developers.openai.com/api/docs/pricing)
- [truefoundry-azure](https://github.com/truefoundry/models/blob/main/providers/microsoft-foundry/o1-pro.yaml)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)
- [models.dev · catalogue](https://models.dev/#o1-pro)
- [OpenCode · discovery](https://opencode.ai/data/openai/o1-pro)
- [OpenRouter](https://openrouter.ai/openai/o1-pro)
- [OpenAI · deprecations](https://platform.openai.com/docs/deprecations)

## Signals

- [O1 Pro: Provider API status update](https://alexgetman.com/signals/2026/09/11/o1-pro/)