Theoretical physicist, SLAC National Accelerator Laboratory and Stanford
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Held the prior eight-loop record; independently verified Claude's nine-loop result
A small physics calculation just became a marker for AI capability. The six-particle scattering amplitude in planar N=4 super-Yang-Mills, a favorite testing ground for theorists, had sat at eight loops since 2023—until Anthropic's Claude pushed it to nine in late August 2026, running unsupervised for days at a cost of a few thousand dollars.
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