AtCoder World Tour Finals is one of the hardest competitive programming contests in the world, gathering the best of the best. And humans got completely cooked by AI, both in the Heuristic contest and in the Algorithm contest. In fact, in the Algorithm contest no human has solved more than 3 problems, whereas OpenAI's model solved all 5.
Heuristic leaderboard: https://atcoder.jp/contests/awtf2026heuristic/standings/exhibition
Heuristic problem description: https://atcoder.jp/contests/awtf2026heuristic/tasks
Algorithm leaderboard: https://atcoder.jp/contests/awtf2026algo/standings/exhibition
Algorithm problems description: https://atcoder.jp/contests/awtf2026algo/tasks