July 29, 2026

Visa used Mythos to hunt for bugs in its own payment network, then open-sourced the harness that made it possible

red and blue cargo ship on body of water during daytime
william william / Unsplash

Visa aimed Anthropic's Claude Mythos at the infrastructure behind billions of daily transactions, a network that spans more than 200 countries and territories, moves money in roughly 160 currencies, and connects nearly 5 billion payment credenti...