A key threshold in AI-driven hacking has been crossed. Models can now autonomously chain multiple, distinct vulnerabilities together to execute complex, multi-step attacks—a capability they lacked just months ago. This significantly increases their potential as offensive cyber weapons.

Anthropic's new AI model, Mythos, is so effective at finding and chaining software exploits that it's being treated as a cyberweapon. Its public release is being withheld; instead, it's being used defensively with select partners to harden critical digital infrastructure, signifying a major shift in AI deployment strategy.

Anthropic's new AI, Claude Mythos, can find software vulnerabilities better than all but the most elite human hackers. This technology effectively gives previously unsophisticated actors the cyber capabilities of a nation-state, posing a significant national security risk.

According to Cloudflare, the leap with Anthropic's Mythos model is its ability to reason like a senior researcher. It doesn't just find individual bugs; it synthesizes multiple vulnerabilities into a functional exploit chain and generates proofs, making it a fundamentally different and more powerful security tool.

Anthropic wasn't trying to build a cyberweapon. Mythos's superhuman hacking abilities emerged incidentally as they made the model generally smarter and better at coding. This suggests any advanced AI could spontaneously develop dangerous, unintended capabilities, a major risk for all AI labs.

Anthropic's AI found thousands of vulnerabilities in supposedly well-vetted open-source code. Because this code is widely copied and embedded in countless enterprise systems, these flaws represent a massive, previously unknown attack surface across global digital infrastructure.

Anthropic's unreleased model, Claude Mythos, is so effective at exploiting software vulnerabilities it triggered emergency meetings with top US financial leaders. This signals a new era where general-purpose AI, even if not specifically trained for it, can become a potent cyberweapon.

Details from an accidental leak reveal Anthropic's next model, Mythos, has "step change" capabilities in cybersecurity. The company warns this signals a new era where AI can exploit system flaws faster than human defenders can react, causing cybersecurity stocks to fall.

Mythos was not trained for cybersecurity. Its powerful ability to find software vulnerabilities emerged from broad improvements in code understanding and reasoning, highlighting how dangerous capabilities can appear unexpectedly in advanced AI models.