AI Models Now Uncover Hundreds of Previously Unknown Zero-Day Vulnerabilities

Anthropic’s Frontier Red Team explains how the company’s latest AI model, Claude Opus 4.6, has shown an unprecedented ability to autonomously find high-severity zero-day vulnerabilities in widely used open-source code without specialized instructions or tooling, reading and reasoning about code in ways traditional fuzzers do not. In tests it identified and helped validate over 500 previously unknown security flaws across major codebases, and the post also discusses efforts to report and patch these issues while building safeguards to manage the dual-use risks of such powerful automated discovery capabilities. 

https://red.anthropic.com/2026/zero-days/

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