Claude Opus 4.6 Unmasks 500 Open-Source Flaws, Redefining Cyber Defense

Anthropic’s Claude Opus 4.6, tested in a sandbox, autonomously found over 500 previously unknown high-severity zero-day vulnerabilities in open-source libraries—ranging from crashes to memory corruption—in projects like GhostScript, OpenSC, and CGIF; it used out-of-the-box analysis and even wrote its own proof-of-concepts in some cases. Anthropic says these capabilities could greatly aid defenders, plans to broaden access to the security community, and has added safeguards to prevent abuse.