Anthropic's unreleased AI model autonomously discovered security vulnerabilities in major platforms including Chrome, Safari, Android, Windows, and Linux, and chained them into working proof-of-concept exploits. The exploits were generated in a controlled lab environment after the model was prompted, and were not observed in any real-world attacks. Anthropic responsibly disclosed all discovered flaws to the respective vendors before publication, and all vulnerabilities have since been patched. This marks a significant demonstration of AI-assisted vulnerability research and exploit development capabilities. The findings raise important questions about the dual-use nature of advanced AI models in cybersecurity contexts.