# o1-pro

> o1-pro is a proprietary language model from OpenAI, released on 19 Mar 2025. It accepts text and images and generates text, with a 200K-token context window and up to 100K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $150 per million input tokens and $600 per million output tokens (OpenRouter), across 1 provider we track. OpenAI has deprecated this model.

Source page: https://www.aimodel.directory/models/o1-pro
Last verified: 4 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 19 Mar 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Status:** Deprecated (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Context window:** 200K (200,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Max output:** 100K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Knowledge cutoff:** Sept 2023 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o1-pro.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $150 | $600 | – | 200K |

## FAQ

### What is the context window of o1-pro?

o1-pro has a context window of 200,000 tokens (200K) and can generate up to 100,000 tokens in a single response, according to models.dev.

### How much does the o1-pro API cost?

o1-pro is listed from $150 per million input tokens and $600 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is o1-pro open source?

No. o1-pro is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenRouter.

### When was o1-pro released?

OpenAI released o1-pro on 19 Mar 2025, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "o1-pro", https://www.aimodel.directory/models/o1-pro