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

Visa aimed Anthropic’s Claude Mythos at the infrastructure behind its payment network, which spans more than 200 countries, moves money in roughly 160 currencies and connects nearly 5 billion payment credentials to more than 175 million merchant locations. The model stitched minor weaknesses deep in the stack into working exploit chains, and Visa open-sourced the harness along with a new metric for verifying that fixes work.

Summarized by AI.

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