On June 8, 2025, the Hierarchical Reasoning Model (HRM) paper was published by Guan Wang et al. The release went viral within the AI community. X/Twitter discussions hit over 4 million views and tens of thousands of likes [1, 2, 3, 4] and YouTube videos dissecting the work surpassed 475K views [1, 2, 3, 4]. The headline claim of the paper: the brain-inspired architecture of HRM scored 41% on ARC-AGI-1 with only 1,000 training tasks and a 27M (relatively small) parameter model. Due to the popular...