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VISA INC. · 2026-07-28 · Importance 29 · Surprise 42

Visa used Anthropic’s Claude Mythos to test the infrastructure supporting billions of daily transactions. The AI system identified weaknesses and combined them into exploit chains that might otherwise have been found only during late-stage penetration testing. Visa subsequently open-sourced the security-testing harness, positioning the work as a technology contribution for broader payment-network security.

Key facts

• Visa used Anthropic's Claude Mythos to find vulnerabilities in its infrastructure and then open-sourced the harness that made it possible. source
• Visa's payments network spans more than 200 countries and territories, moves money in roughly 160 currencies, and connects nearly 5 billion payment credentials to more than 175 million merchant locations. source