Schema Harness Achieves ~99% on Arc‑AGI‑3 Public

Impossible Research [schema] Frontier Models with Our Harness Achieve ~99% on ARC‑AGI‑3 Public We introduce Schema, a harness that has frontier models play like physicists: write each game’s mechanism as an executable program, test it against reality, and plan inside it. The name is inspired by Immanuel Kant: a schema is a rule of construction that bridges from abstract concept to concrete perception. Guanning Zeng1* · Jiani Wang1 · Wenjie Ma2 · Shaofeng Yin1 · Chenyang Wang1 · Shichen Liu1 · An