Hyderabad, Sept. 11 -- An engineering group in northern Yemen used Anthropic's Claude AI models to write the guidance software for a rocket it later test-fired, the company said in a report published on Thursday, September 10.

The test appeared to fail. Within hours, the operators were back on Claude trying to work out what had gone wrong.

The Yemen operation was one of six cases in which Anthropic said its models had been used in weapons-related work. The company also identified separate cases involving surveillance systems developed for government agencies.

The report covers activity Anthropic detected and shut down between December 2025 and August 2026. The company said it banned all the accounts involved and shared information with...