A Yemen Cell Ran Three Weapons Programs on Claude Code, Coming Back Within Hours of a Failed Test Fire to Debug the Guidance Software
Arab News / Anthropic threat report·high signal
Anthropic's September 10 threat report documents a small cell in northern Yemen that used Claude Code to write guidance, navigation and control software across three simultaneous programs: a guided rocket using a commodity phone-class flight computer with terminal homing, a multi-stage ballistic missile, and a multi-variant missile including a hypersonic glide vehicle. After a live test fire failed, the operators returned to Claude within hours to diagnose why. Anthropic banned the accounts and says it has no evidence an operational weapon was fielded, but also found the group had built an offline simulation toolkit, meaning part of the engineering no longer depends on Claude or on licensed tools like MATLAB.