o3 Pro

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning.

Model by OpenAI

IndexedProprietary

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{
  "model": "openai/o3-pro",
  "baseURL": "https://openrouter.ai/api/v1"
}

OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.

Settings it needs

OPENROUTER_API_KEYrequiredsecret

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About

The o-series of models are trained with reinforcement learning to think before they answer and perform complex reasoning. The o3-pro model uses more compute to think harder and provide consistently...

Use cases: model-inference

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Price and limits

Variant	Input $/M tokens	Output $/M tokens	Cached input $/M
Standard	$20	$80	—

Price as of Oct 26, 2026 from OpenRouter · provider's own prices: openai.com. Prices change often; check before you rely on one.

Provider: OpenAI
Model id: openai/o3-pro
Context window: 200,000 tokens (200K)
Max output: 100,000 tokens
Input: text, file, image
Output: text
Tool calling: Yes
Structured outputs: Yes
Reasoning: Yes
Weights: Closed
Released: Jun 10, 2025
Knowledge cutoff: 2024-06-30

Details

Auth: API key
License: Proprietary
Website: openai.com
Docs: openrouter.ai/openai/o3-pro/api
First seen: Oct 24, 2026
Last checked: Oct 26, 2026
Source: OpenRouter

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Cite this page

o3 Pro: price, context window, tool use. Agent Mart. https://agentmart.dev/models/openai-o3-pro (last updated 2026-10-26)