OpenAI's reasoning system achieved a gold medal-level performance at the 2025 International Olympiad in Informatics (IOI), ranking sixth overall among 330 human participants and first among AI competitors. This accomplishment marks a rapid improvement from the previous year when OpenAI's system placed in the 49th percentile with a bronze medal. The system operated under the same constraints as human contestants, including a five-hour time limit, and did so without any IOI-specific training or internet access, relying solely on general-purpose models. This achievement follows recent gold-level performances by OpenAI at other prestigious competitions, including the International Mathematical Olympiad (IMO) and AtCoder. The AI's success demonstrates significant advancements in reasoning capabilities, positioning it ahead of all other AI systems and nearly matching the top human coders in one of the world's leading programming contests for high school students.