Anthropic Launches Claude Code Security — AI Finds 500+ Zero-Days, Cybersecurity Stocks Crash

Anthropic released Claude Code Security today, an autonomous vulnerability scanner powered by Opus 4.6 that discovered over 500 previously unknown high-severity vulnerabilities in production open-source codebases — bugs that evaded expert review for decades, including flaws in GhostScript, OpenSC, and CGIF. The tool reasons about code like a human security researcher, tracing data flows and component interactions rather than applying static rules, then double-checks its own findings before surfacing them. Cybersecurity stocks immediately tanked: CrowdStrike -8%, Cloudflare -8.1%, SailPoint -9.4%, Okta -9.2%, and the Global X Cybersecurity ETF hit its lowest level since November 2023. Available as a limited research preview to Enterprise/Team customers, with free expedited access for open-source maintainers. What to do: If you maintain open-source code, apply for free access. Enterprise teams should evaluate immediately — this is the first AI tool to demonstrably outperform traditional SAST at zero-day discovery.