Anthropic's Mythos Preview was highly effective at finding vulnerability candidates, especially when analyzing source code. XBOW explores how the model performed across exploit discovery, reverse engineering, and live-site validation.

Advanced models are just as effective at rapidly weaponizing flaws that defenders already know about.

Anthropic says Mythos is too dangerous for public release but gave 150 more organisations access. Only 14% of 10,000+ critical flaws found have been patched. Claims are unverified.