Anthropic's super-scary bug hunting model Mythos is shaping up to be a nothingburger

Anthropic's Mythos preview model was reportedly accessed without authorization via a third‑party vendor tied to supply‑chain incidents; Anthropic says its own systems were not affected and the access was limited to the vendor environment. Early analysis and security researchers suggest Mythos is a useful vulnerability-finding assistant but not a game-changing zero-day weapon, and experts characterize the incident as a supply-chain/insider exposure rather than evidence of active, widespread exploitation.