UK AI Security Institute: Claude Mythos Preview Scores 73% on Expert Cyber CTFs, Completes 32-Step Corporate Network Attack Autonomously

r/singularity·high signal

The UK AI Security Institute published its evaluation of Claude Mythos Preview, finding it succeeds 73% of the time on expert-level cybersecurity CTF tasks that no prior model could complete before April 2025. It became the first AI model to finish a 32-step corporate network attack simulation end-to-end without human assistance — tasks that would take professional red teams days. Anthropic's Project Glasswing restricts access to 12 launch partners including AWS, Apple, Google, Microsoft, and CrowdStrike for defensive vulnerability discovery.