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What do we know about Anthropic's Mythos amid rising concerns?

The preview found 1,000s of flaws in major operating systems and browsers, and U.S. and British officials briefed banks on the risks.

  • Earlier this month, Anthropic debuted Claude Mythos Preview through Project Glasswing, granting access to Amazon, Microsoft, Nvidia, Apple, and more than 40 organizations maintaining critical software infrastructure.
  • Mythos sparked security fears after Anthropic said the preview uncovered "thousands" of major vulnerabilities in "every major operating system and web browser," with experts warning the model identifies flaws faster than companies can repair them.
  • Software stocks tumbled on April 9 following the April 7 launch, as Treasury Secretary Scott Bessent and Federal Reserve Chair Jerome Powell briefed CEOs of major banks on potential risks.
  • The government plans to provide federal agencies with a version of Mythos, as officials continue to evaluate the model's defensive cybersecurity capabilities alongside its potential for misuse.
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Reuters broke the news in United Kingdom on Monday, April 20, 2026.
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