CHOI(@arrakis_ai):WTF... OpenAI just solved all five problems in the Algorithm division of the AtCoder World Tour Finals. Using E869120's well-known difficulty scale, a 1500-rated problem is the kind of challenge researchers can spend months working on. The two 2500-rated problems go far beyond AtCoder's usual upper limit of around 1800. Even the "easiest" 900-rated problem—one of the first three solved in just 38 minutes—is difficult enough that even world-class competitive programmers have roughly a 50-50 chance of solving it within the contest time. The amount of time that the hardest problems humans can create are able to resist AI is getting shorter and shorter. Congrat @OpenAI

2026.07.09 08:00

WTF... OpenAI just solved all five problems in the Algorithm division of the AtCoder World Tour Finals. Using E869120's well-known difficulty scale, a 1500-rated problem is the kind of challenge researchers can spend months working on. The two 2500-rated problems go far beyond AtCoder's usual upper limit of around 1800. Even the "easiest" 900-rated problem—one of the first three solved in just 38 minutes—is difficult enough that even world-class competitive programmers have roughly a 50-50 chance of solving it within the contest time. The amount of time that the hardest problems humans can create are able to resist AI is getting shorter and shorter. Congrat @OpenAI