Anthropic's Mythos AI found over 2,000 unknown software vulnerabilities in just seven weeks of testing

This material may not be published, broadcast, rewritten, or redistributed. ©2026 FOX News Network, LLC. All rights reserved. Quotes displayed in real-time or delayed by at least 15 minutes. Market data provided by Factset. Powered and implemented by FactSet Digital Solutions. Legal Statement. Mutual Fund and ETF data provided by LSEG. Fox News Flash top headlines are here. Check out what's clicking on FoxNews.com. There is a new AI model called Mythos. Anthropic built it for defensive cybersecurity research. It is so effective at finding software vulnerabilities that Anthropic decided the general public cannot have it. Instead, it is letting a small circle of trusted partners like Microsoft and Google experiment with it first under controlled conditions, while researchers figure out what guardrails need to exist. That decision alone should tell you something. When the company that built a tool decides the world is not ready for it, you pay attention. And when you understand what Mythos actually did during testing, that caution starts to make complete sense. WINDOWS PCS AT RISK AS NEW TOOL DISARMS BUILT-IN SECURITY Anthropic’s Mythos AI uncovered more than 2,000 unknown software vu