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Cybersecurity Stocks Slide Following Anthropic 'Claude Mythos' Data Leak - CrowdStrike Holdings (NASDAQ:CRWD)

Anthropic’s new model, Claude Mythos, is considered a major advancement in AI cybersecurity and is being tested by select customers following a data leak.

  • Draft documents inadvertently exposed by Anthropic in an unsecured data store revealed 'Claude Mythos,' a new AI model the company describes as 'by far the most powerful' it has ever developed.
  • Cybersecurity researchers Roy Paz and Alexandre Pauwels discovered the unsecured cache, prompting Anthropic to acknowledge that 'human error' in its external CMS tools led to the exposure.
  • Anthropic describes 'Capybara' as a new tier surpassing Opus, noting the system is 'currently far ahead of any other AI model in cyber capabilities' and poses unprecedented security risks.
  • To mitigate risks including a Chinese state-sponsored group's infiltration of roughly 30 organizations, Anthropic is limiting the model to early access customers to improve codebases against AI-driven exploits.
  • Leaked documents also revealed plans for an invite-only CEO summit in the English countryside, demonstrating Anthropic's strategy to market these high-capability models to large corporate customers.
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Fortune broke the news in New York, United States on Thursday, March 26, 2026.
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