Anthropic Keeps Its Most Powerful Model Locked Away: Mythos Found Thousands of Bugs, Won't Sell It

Sat, 11 Apr 2026 00:00:00 +0000

Anthropic has the most capable AI model it has ever built. It can uncover thousands of security vulnerabilities across major operating systems and browsers — some issues have existed for ten to twenty years.

Then it decided: this product won’t be sold.

Project Glasswing: A Quiet but Massive Operation

The model is called Claude Mythos Preview, and Anthropic’s secret project to contain it is called Project Glasswing.

The approach is not open-sourcing, not public release, and not enterprise sales. Anthropic went directly to “those actually maintaining the cyber infrastructure of the internet” — eleven partner organizations including Amazon Web Services, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, Linux Foundation, Microsoft, Nvidia, and Palo Alto Networks, plus an additional forty-plus organizations maintaining critical software infrastructure — granting all of them access.

Security on AI Brief | AI-101.tech

Anthropic Keeps Its Most Powerful Model Locked Away: Mythos Found Thousands of Bugs, Won't Sell It

Project Glasswing: A Quiet but Massive Operation