Anthropic Just Released a Model Too Dangerous for Public Use. They Called It Project Glasswing.

When Your AI Finds Bugs That Have Been Hiding for 27 Years Anthropic released a new model today. Sort of. Claude Mythos is a general-purpose model, similar to Claude Opus 4.6, but with a terrifying specialty: it found vulnerabilities in every major operating system and web browser . So Anthropic decided not to release it publicly. Instead, they launched Project Glasswing — a restricted access program that gives the model only to vetted security researchers and major tech partners. AWS, Apple, Microsoft, Google, and the Linux Foundation get access. The rest of us get to read about it. What Makes Mythos Different? The numbers from Anthropic's internal evaluations are stark: Opus 4.6 : Near-0% success rate at autonomous exploit development Mythos Preview : 181 successful exploits out of several hundred attempts on Firefox's JavaScript engine, plus 29 more achieving register control Nicholas Carlini, one of Anthropic's security researchers, said: "I've found more bugs in the last couple of