Department of War Launches OpenAI's ChatGPT Mil on GenAI.mil

View Online Department of War Launches OpenAI's ChatGPT Mil on GenAI.mil Aug. 31, 2026 |  By War.gov The Department of War today launched OpenAI's ChatGPT Mil, marking it as the next frontier AI capability housed on GenAI.mil, the Department's premier generative AI platform. This milestone represents the adoption phase of an enterprise partnership established between the Department and OpenAI in 2025. Accredited for Controlled Unclassified Information (CUI) at Impact Level 5 (IL5), ChatGPT Mil is engineered for secure, consistent enterprise use. ChatGPT Mil brings a familiar commercial experience into the Department's secure environment, tailored to warfighter needs. The core experience centers on chat, files, projects, and custom GPTs, with additional features sequenced over time. ChatGPT Mil supports document-heavy unclassified work across the Department, including planning, policy, logistics, and administration, and is built for scale to support more than 3 million Department personnel. This deployment accelerates routine tasks and frees up time for more critical projects across the Joint Force. Integrating ChatGPT Mil into GenAI.mil alongside existing frontier AI capabilities establishes a robust, multi-model ecosystem for the warfighter.  Through the Chief Digital and AI Office (CDAO) and the Office of the Under Secretary of War for Research and Engineering, the Department will continue scaling frontier AI as a force multiplier across the Joint Force. This launch supports the White House's AI Action Plan and reinforces the Department of War's commitment to leading the adoption of AI for warfighter mission sets and decision superiority.

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