OpenAI releases AI reasoning model o3-pro

OpenAI on Tuesday announced the launch of o3-pro, the company's most advanced reasoning artificial intelligence (AI) model to date.

O3-pro is a version of OpenAI's o3, a reasoning model first introduced earlier this year. Reasoning models solve problems step by step, making them more reliable in fields such as physics, mathematics, and computer programming.

The o3-pro model is available starting Tuesday for ChatGPT Pro and Team users, replacing the previous o1-pro model. Enterprise and Edu users will gain access the following week, according to OpenAI. O3-pro is also now live in OpenAI's developer API as of Tuesday afternoon.

The model is priced at 20 U.S. dollars per million input tokens and 80 dollars per million output tokens in the API. One million input tokens are approximately equivalent to 750,000 words.

"In expert evaluations, reviewers consistently preferred o3-pro over o3 in every tested category -- especially in key areas like science, education, programming, business, and writing assistance," OpenAI stated. "Reviewers also rated o3-pro consistently higher for clarity, comprehensiveness, instruction-following, and accuracy."

O3-pro has access to a range of tools, including web browsing, file analysis, visual reasoning, Python execution, and personalized memory-based responses, according to the company.

In internal testing, o3-pro achieved impressive results in widely used AI benchmarks. On AIME 2024, which assesses mathematical ability, o3-pro outperformed Google's Gemini 2.5 Pro. It also surpassed Anthropic's Claude 4 Opus on GPQA Diamond, a benchmark for PhD-level science knowledge, the company reported.