Unauthorised Group Breaks into Anthropic's Restricted Mythos Model via Stolen Contractor Credentials
An unnamed group operating through a private Discord obtained access to Claude Mythos — Anthropic's most powerful, deliberately withheld model — by exploiting credentials from a third-party contractor, gaining entry on the same day the model was publicly announced. The group provided Bloomberg with screenshots and live demonstrations as proof of access. Anthropic confirmed it is investigating but says there is no evidence its own systems were directly compromised.