Project Glasswing boosts defenders with Claude Mythos Preview

Project Glasswing gave a small group of large US tech firms early access to the Claude Mythos Preview vulnerability-finding model. According to the author's analysis of public vulnerability data, treated firms more than doubled their disclosures relative to firms without access, found more high-impact flaws themselves, and saw fewer reports from external bug bounty researchers. The author argues that while frontier AI helped defenders find and fix flaws before exploitation, its restricted release creates a security asymmetry between firms in different countries. Open article →