The US civilian federal agency ban on DeepSeek took effect in July 2026, nearly three months before the US Department of Homeland Security made it public on October 19, 2026

In October 2026, the US Department of Homeland Security made public a July 2026 order that removes Chinese AI company DeepSeek's products, and third-party services built on its models, from civilian federal agency IT systems and bars agencies from buying them, citing national security and data risks.