Claude Mythos Preview

Trends

• Frontier cyber capability ships to defenders behind gated access
• Frontier labs gate releases behind capability thresholds and safeguard tiers

Items

1. Jun 2

   Anthropic expands Project Glasswing

   After ~50 initial partners using Claude Mythos Preview surfaced more than 10,000 high- or critical-severity flaws, the program extends to ~150 new organizations across 15+ countries in power, water, healthcare, communications, and hardware.

2. May 12

   EU seeks cyber model access from OpenAI, Anthropic

   The European Commission confirmed talks on supervised access to GPT-5.5-Cyber, with Claude Mythos talks at an earlier stage, after the IMF warned that AI-powered cyberattacks pose a credible systemic risk to global financial stability.

3. Apr 7

   Anthropic withholds Claude Mythos Preview

   Anthropic's most capable model (93.9% on SWE-bench) autonomously found thousands of high-severity zero-days across every major OS and browser, so it goes only to Project Glasswing, a defensive coalition including AWS, Apple, Google, Microsoft, and the Linux Foundation, backed by $100M in usage credits.