# o3-pro

> o3-pro is a proprietary language model from OpenAI, released on 10 Jun 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 $20 per million input tokens and $80 per million output tokens (OpenAI API), across 3 providers we track.

Source page: https://www.aimodel.directory/models/o3-pro
Last verified: 4 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 10 Jun 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Context window:** 200K (200,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Max output:** 100K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Knowledge cutoff:** May 2024 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/o3-pro.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenAI API | $20 | $80 | – | 200K |
| OpenRouter | $20 | $80 | – | 200K |
| Vercel AI Gateway | $20 | $80 | – | 200K |

## FAQ

### What is the context window of o3-pro?

o3-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 o3-pro API cost?

Through OpenAI API, o3-pro costs $20 per million input tokens and $80 per million output tokens. Prices last verified 4 Oct 2026.

### Is o3-pro open source?

No. o3-pro is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenAI API, OpenRouter, Vercel AI Gateway.

### When was o3-pro released?

OpenAI released o3-pro on 10 Jun 2025, according to models.dev.

### Which providers offer o3-pro?

We track o3-pro on 3 providers: OpenAI API, OpenRouter, Vercel AI Gateway.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "o3-pro", https://www.aimodel.directory/models/o3-pro