Yemen cell used Claude to write missile guidance software
Anthropic — Anthropic blocked accounts behind AI weapons development in Houthi-held Yemen, where a cell drove Claude Code for guidance, navigation and control programming across three arms efforts. From December 2025 to August 2026 on Claude Haiku, Sonnet and Opus, the missile guidance push targeted a guided rocket, a ballistic multistage missile reaching beyond 2,000km, plus proposed hypersonic glide vehicle concepts. A rocket trial misfired; no functioning weapon emerged, though the cell's offline simulation kit survived.


