OpenAI claims its experimental LLM has achieved gold-medal performance on the International Math Olympiad (IMO) 2025, solving 5 out of 6 problems under the same rules as human contestants. The model was evaluated on its ability to craft intricate, watertight arguments at the level of human mathematicians. The achievement is seen as a significant milestone in AI progress, demonstrating the model's capability in sustained creative thinking and general-purpose reinforcement learning. The model's solutions to the 2025 IMO problems are available on GitHub.