Anthropic found Russian and Chinese threat actors using its artificial intelligence chatbot Claude as a weapons engineering assistant, helping develop drone software, anti-torpedo weapons systems, and more.

The extensive report, published Thursday, also detailed activities by a Yemen-based weapons engineering cell and an unspecified Iran-nexus threat actor. The latter used Claude to collect targeting data on US naval forces.

The findings provide examples of a frontier American AI model being used to advance adversarial military capabilities.

Anthropic’s report on the misuses of Claude, from cybersecurity and bioweapons research to engineering…