o3-pro
Summary
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.
High-effort o3 tier for difficult technical reasoning and careful answers
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 10 Jun 2025 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 200K (200,000 tokens) [models.dev] |
| Max output | 100K tokens [models.dev] |
| Knowledge cutoff | May 2024 [models.dev] |
| Input | Text and images [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
o3-pro API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenAI API o3-pro | $20 | $80 | – | 200K | models.dev, 4 Oct 2026 |
| OpenRouter openai/o3-pro | $20 | $80 | – | 200K | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway openai/o3-pro | $20 | $80 | – | 200K | models.dev, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.