U.S. bans DeepSeek from government agency systems amid AI rift with China

AI teams selling into the U.S. government should treat DeepSeek as off-limits for federal civilian deployments. The Department of Homeland Security has banned DeepSeek-related technology from federal civilian agency IT systems, turning security concerns around Chinese AI products into a concrete procurement and deployment restriction. The ban affects more than direct use of DeepSeek models. Builders will need to audit applications, third-party services, model routers, dependencies, and data pipelines for DeepSeek components before pursuing federal work. It also adds regulatory risk to choosing low-cost Chinese models, even when their technical performance is competitive. For vendors serving government customers, model provenance and supply-chain documentation are becoming core product requirements, not just compliance paperwork.