Anthropic pointed its most advanced AI model, Claude Opus 4.6, at production open-source codebases and found a plethora of security holes: more than 500 high-severity vulnerabilities that had survived decades of expert review and millions of hours of fuzzing, with each candidate vetted through internal and external security review before disclosure. Fifteen days later, the company productized the capability and launched Claude Code Security.Security directors responsible for seven-figure vulnera...