Anthropic Report: Yemen Group Used Claude AI to Develop Missile Guidance Software

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Anthropic published a 154-page threat intelligence report on September 10, 2026, revealing six cases of its Claude AI being misused for weapons development between December 2025 and August 2026. One case involved a group in northern Yemen that used Claude to write guidance, navigation, and control software for three concurrent weapons projects, including a multi-stage missile with a range exceeding 2,000 km and a hypersonic glide variant called the R2000. The group conducted at least one live rocket test and later returned to ask Claude to help diagnose why the launch had failed. Anthropic stated it detected and terminated the accounts involved, and found no evidence that any of the weapons were successfully operationalized. The report also covered cases in China and Russia, spanning areas such as drone swarm software, torpedo countermeasures, and procurement support for defense clients.

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