OpenAI and Google DeepMind achieved a major milestone by solving 5 out of 6 problems at the International Mathematical Olympiad (IMO) 2025 within the human time limit of 4.5 hours, earning the IMO Gold medal. This breakthrough was accomplished using general-purpose reinforcement learning and pure in-weights reasoning without specialized tools or internet access, surpassing previous systems like AlphaProof and AlphaGeometry2.

The success resolved a 3-year-old AI bet on AI's capability to solve IMO problems and sparked discussions among mathematicians including Terence Tao. Despite this, 26 human competitors remain better than AI on the hardest combinatorics problem (P6). The achievement highlights advances in reinforcement-learning, reasoning, and model-scaling in AI research.