Research · 7 April 2026

Project Glasswing gives select partners Claude Mythos Preview to hunt software flaws

Anthropic announced Project Glasswing, giving 11 partners including AWS, Apple, Google, Microsoft and the Linux Foundation access to an unreleased model, Claude Mythos Preview, to find and fix vulnerabilities in critical software. Anthropic said the model found thousands of serious zero-days, and committed $100M in usage credits plus donations to open-source security groups. For security teams, it marked the point where frontier labs began withholding general release of models because of their offensive cyber capability.