Overview
o3-pro is a reasoning model from OpenAI that uses more compute to answer hard problems with better reasoning and consistency. It accepts text and image input, returns text, and supports tool calling and structured output, with a 200,000-token context window for long source material.
It has a 200,000-token context window and can generate up to 100,000 output tokens. It accepts text and image input and returns text. Its knowledge cutoff is June 1, 2024, and it was released on June 10, 2025.
Capabilities
o3-pro supports reasoning, tool calling, structured output and image understanding. It takes text and image input and returns text.
OpenAI documents its difference as extra compute per answer, intended to give better reasoning and more consistent results on difficult questions.
Pricing
o3-pro is priced at $20.00 per 1M input tokens and at $80.00 per 1M output tokens.
o3-pro is available through RealRelay's OpenAI-compatible API.
Use cases
Use o3-pro for difficult questions in math, science and coding where reliability matters more than a quick answer, such as validating a complex algorithm or reviewing a technical argument.
Visual input lets charts and screenshots join the question, and tool calling lets the model gather data before it commits to an answer.
What is o3-pro?
o3-pro is an OpenAI reasoning model that uses more compute to answer hard problems with better reasoning and consistency, with image input and a 200,000-token context window.
How much does o3-pro cost?
o3-pro is priced at $20.00 per 1M input tokens and at $80.00 per 1M output tokens.
What is the context window and maximum output of o3-pro?
o3-pro has a 200,000-token context window and can generate up to 100,000 output tokens.
What inputs and outputs does o3-pro support?
o3-pro accepts text and image input and returns text.
What capabilities does o3-pro support?
o3-pro supports reasoning, tool calling, structured output and image understanding.
When was o3-pro released?
o3-pro was released on June 10, 2025.
How do I call o3-pro via the API?
Call o3-pro through RealRelay's OpenAI-compatible API using the model ID openai/o3-pro.