Anthropic just released the most capable offensive cybersecurity AI ever built, found thousands of previously unknown zero-day vulnerabilities across every major operating system and browser, and then decided the model was too dangerous to release to the public. That is not a hypothetical scenario. That is what happened on April 7, 2026, and every CISO needs to understand the full weight of what it means. The model is called Claude Mythos Preview . The initiative built around it is called Project Glasswing . Together, they represent something genuinely different from every AI-in-security announcement that has come before — not because of marketing language, but because of what the model demonstrably did when turned loose on real production software, autonomously, without a human guiding each step. What Claude Mythos Preview Actually Did Anthropic used Claude Mythos Preview over several weeks to conduct autonomous vulnerability research across critical software infrastructure...
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