An Anthropic engineer with zero security training asked Claude Mythos to find remote code execution bugs overnight. He woke up to a complete working exploit.
That’s the kind of model Anthropic announced on April 7. Claude Mythos Preview is, by every published benchmark, the most capable AI model ever built. It scores 93.9% on SWE-bench Verified, 97.6% on the USAMO math olympiad, and 83.1% on CyberGym. It found zero-day vulnerabilities in every major operating system and every major web browser. Fully autonomously. No human guidance needed.
Anthropic’s response to building it: don’t release it. Instead, the company launched Project Glasswing, a cybersecurity defense initiative that gives the model to Amazon, Apple, Google, Microsoft, Nvidia, CrowdStrike, JPMorgan Chase, Cisco, Broadcom, Palo Alto Networks, and the Linux Foundation. About 40 additional organizations that maintain critical software infrastructure also get access. Anthropic is committing $100 million in usage credits and $4 million in direct donations to open-source security organizations.
This is the first time a leading AI lab has built a frontier model and simultaneously decided the public cannot use it.