OpenAI deployed ChatGPT for US government and defense use through its OpenAI for Government platform, including a $200 million Pentagon contract and deployment on the DoD's GenAI.mil platform for approximately 3 million personnel.

OpenAI launched OpenAI for Government in June 2025 alongside a $200 million contract with the Pentagon's Chief Digital and Artificial Intelligence Office (CDAO) to prototype frontier AI for defense administrative operations. In February 2026, OpenAI reached an agreement to deploy its models on classified Department of Defense networks with stated safety guardrails. ChatGPT was subsequently deployed on GenAI.mil, the Pentagon's enterprise AI platform, for approximately 3 million military and civilian personnel. Use cases include summarizing policy documents, drafting procurement materials, and supporting cyber defense.