Anthropic Leaks Claude Mythos in CMS Failure: The Most Capable AI Model—And Biggest Cyber Risk—They've Ever Built
Anthropic's CMS misconfiguration exposed Claude Mythos—a new AI model tier called Capybara that's 'far ahead of any other AI model in cyber capabilities.' The leak revealed draft launch plans, cybersecurity risk assessments, and an invite-only CEO summit. Enterprise security teams need to understand what ' unprecedented cybersecurity risks' means for their threat models.
March 29, 2026 · 11 min read