NSA, CISA, and FBI Warn That China-Based AI Firms Are Distilling US Frontier Models

A joint advisory from the NSA, CISA, and FBI warns that China-based AI companies are systematically using knowledge distillation techniques to extract capabilities from US frontier models — effectively training competitive models on outputs generated by GPT-class and similar systems without authorization. The advisory flags this as both an intellectual property concern and a national security issue, as distilled models could be used to power adversarial AI applications. For developers and enterprises deploying frontier model APIs, this raises questions about output logging, terms-of-service enforcement, and what constitutes acceptable downstream use of model outputs. It also has implications for AI companies considering API rate limits, output watermarking, or behavioral fingerprinting as defensive measures. This is the clearest official US government signal yet that AI model distillation is being treated as a strategic threat.