Anthropic has launched Claude Code Security, an AI-driven tool designed to scan codebases for vulnerabilities and suggest patches, sparking significant market reactions. The tool, which uses advanced large language models like Claude Opus 4.6, aims to identify business logic flaws and broken access controls that traditional scanners might miss. During internal tests, it uncovered over 500 high-severity vulnerabilities in open-source codebases. The announcement led to a sharp decline in cybersecurity stocks, with companies like Crowdstrike and Cloudflare seeing drops of around 8%. The broader Global X Cybersecurity ETF fell by 5%, reflecting investor concerns over AI's potential to disrupt traditional security models. Despite fears of job displacement, Anthropic emphasizes that Claude Code Security is designed to assist, not replace, human security teams, requiring human approval for all fixes.