o3

o3 is a well-rounded and powerful model across domains.

Model by OpenAI

IndexedProprietary

Install

Pick your client. Read the repository before you give any tool access to your data.

{
  "model": "openai/o3",
  "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

o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following....

Use cases: code-generation, documentation

Reviews

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Price and limits

Variant	Input $/M tokens	Output $/M tokens	Cached input $/M
Standard	$2	$8	$0.5
Batch API `openai/o3:batch`	$1	$4	—

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
Context window: 200,000 tokens (200K)
Max output: 100,000 tokens
Input: image, text, file
Output: text
Tool calling: Yes
Structured outputs: Yes
Reasoning: Yes
Weights: Closed
Released: Apr 16, 2025
Knowledge cutoff: 2024-06-30

Details

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

More from OpenAI

Cite this page

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