Visa used Mythos to hunt for bugs in its own payment network, then open-sourced the harness that made it possible
THE SO WHAT
Visa pointing Anthropic’s Mythos at a network that touches nearly 5 billion credentials and 175 million merchants — then open-sourcing the harness — is a strong proof that LLMs are moving into core infra testing, not just code autocomplete. If you run high-stakes systems, the question isn’t whether to use AI for security review, but how to wrap it in reproducible harnesses and governance you’d be comfortable publishing.
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