Yes. In its September 2026 threat intelligence report, Anthropic said it identified and disrupted a northern Yemen weapons-engineering cell (tracked internally as GTG-87001) that used Claude—including Claude Code—to help write guidance, navigation, and control software for weapons projects.
According to the company and contemporaneous coverage of the report, the cell worked on a guided rocket, a multi-stage ballistic missile with a stated range goal of more than 2,000 km, and an “R2000” family that included a hypersonic glide vehicle variant. Anthropic said it banned the accounts and shared intelligence with partners, and that it has no evidence the group built a working weapon, though a guided-rocket test-fire appeared to fail.
Source: Anthropic — Detecting and countering misuse of AI: September 2026