Claude completes a nine-loop particle-physics calculation, with expert checks and public data
Anthropic published an account of Fable 5.1 computing the nine-loop six-particle MHV amplitude in planar N=4 super-Yang–Mills theory with little human direction. Physicist Lance Dixon describes checking the result, and the released files include two calculation routes whose compared symbol coefficients agree.
Why it made the cut: A frontier calculation in a specialist field, expert validation, and inspectable output provide concrete evidence of AI carrying out extended scientific work. This uses established methods in a simplified theory, not a new physical principle or direct prediction for real particles. The full-function result rests on an additional assumption and has no second independent computation; the computation programs are not released. Anthropic paid the guest author and provided Dixon usage credits.
Official announcement and expert assessment · Technical description, validation details, and result data
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