At the AtCoder World Tour Finals 2026, an OpenAI AI system achieved a dominant performance in an exhibition match, solving all five problems in the Algorithm Division. The contest, which brings together the world's best competitive programmers, featured a 'Human vs. AI' format, with an OpenAI AI agent facing off against human finalists. The AI system solved all five problems, finishing first by a wide margin. A 'Humanity Prevails Award' of 600,000 yen was offered to any participant who could beat the AI and finish first, but no human competitor succeeded in doing so.
The problems presented an unusual challenge. Competitive programmer Psyho (FakePsyho) noted that AtCoder's onsite Algorithm track typically features problems that are highly thinking-intensive but relatively easy to implement. However, this contest included two problems, D and E, that were significantly harder than usual. Initially, the AI struggled with these problems, taking about three hours to solve problem D. By the end, all five problems were solved, and the AI system secured first place with 8,300 points, while the runner-up scored 4,300 points. No human competitor solved problems C or E.
Borys Minaiev, an ICPC world champion working on reasoning models at OpenAI, commented during the livestream that the result was unexpected. He noted that the system had previously solved all problems in under an hour, but problems D and E were significantly more challenging than any AtCoder problems the team had encountered before. Minaiev also mentioned that the system's architecture includes a model comparable to GPT-5.6, which ships this Thursday. The system had no internet access and was run on a small harness to scale compute at test time. Six months ago, the team would not have been able to solve most of these problems. Shortly after the livestream, the AI system solved the final problem E.
Source: thedecoder
