Prime Intellect researcher @sethkarten reveals the reason Prime Agent hit 95.5% on ARC-AGI-3 with Opus 5, matching the human expert baseline: "The abstract and symbolic reasoning that is provided by learning how to model the world in these novel game environments in ARC-AGI-3 make it a very useful benchmark for general reasoning capabilities of the models." "95.5% is a fantastic score. That was with Prime Agent running with Opus 5, and we found that Opus 5 was able to greatly take advantage…