Zenithon

Zenithon is a London AI company building world models for extreme physics: models that learn how fusion reactors, rocket engines, and chip fabs behave and predict design outcomes far faster than conventional simulation. It was co-founded by Alex Higginbottom and Abetharan Antony, and Commonwealth Fusion Systems co-founder Dan Brunner is an adviser. In September 2026 it raised $10 million from BACKED, Lunar, Seraphim, MMC, and SOSV, mostly for compute and hiring in San Francisco.