Anthropic Says Claude Computed a Nine-Loop Particle-Physics Amplitude on a Research Budget

Anthropic says Claude Fable 5.1, running inside its Claude Science research harness, computed a nine-loop six-particle amplitude in planar N=4 super Yang-Mills, moving one loop beyond the eight-loop result previously reached by human researchers. The company published the account on September 25, saying the result was checked by Stanford and SLAC physicist Lance Dixon and produced for an estimated end-user cost of about $1,000 to $2,000 per route.