o3-mini-2025-01-31

o3-mini is the first lightweight intelligent model launched by OpenAI, featuring adjustable third-level reasoning intensity. It’s a compact reasoning model designed to deliver high cost-effectiveness, specifically optimized for STEM fields while balancing speed and accuracy. The model offers three adjustable tiers—low, medium, and high—and, for the first time, grants free users access to its reasoning capabilities. At medium reasoning intensity, o3-mini matches the performance of o1, while at high intensity, it surpasses both o1 and o1-mini. In Codeforces, performance continues to improve as reasoning intensity increases, and in FrontierMath, o3-mini, paired with Python tools, successfully tackles 32% of the problems for the first time.

In benchmark tests, o3-mini achieved an 83.6% accuracy rate at high reasoning intensity and 76.2% at medium intensity in the AIME 2024 competition; in the GPQA Diamond doctoral-level science test, it demonstrated 77.0% accuracy at high intensity and 71.5% at medium intensity. Additionally, in the Codeforces programming competition, o3-mini scored an Elo rating of 2073 at high intensity and 1950 at medium intensity, while in the SWE-bench Verified software engineering test, it achieved 48.9% accuracy at high intensity and 42.3% at medium intensity.

o3-mini supports function calls, structured outputs, developer messages, batch APIs, and streaming output features, making it ready for direct deployment in production environments. It also introduces a new search functionality prototype that can locate the latest answers and provide links to relevant web resources.

Official reasoning model guide URL: https://platform.openai.com/docs/guides/reasoning?api-mode=responses