Anthropic's restricted Mythos model breached classified government systems "in hours."

A US official told the AP that during Project Glasswing testing with intelligence agencies, Anthropic's gated Mythos model found vulnerabilities in classified systems "not in weeks but in hours." Sen. Mark Warner aired the claim at a June 11 Senate Banking hearing. (CNN Business / AP) The model identified flaws but reportedly didn't exploit them. Two things are true at once here. Frontier offensive-security capability is now real enough that the most capable models ship behind government-gated access, and that same capability is exactly what defenders need. If a model can find your vulns in hours, you want it running on your side first. Plan for a near future where vuln discovery is cheap and automated for both attackers and defenders, and the advantage goes to whoever runs it on their own codebase before the other side does.