US Department of War adds ChatGPT and Grok to GenAI platform with over 1.7 million users

The United States Department of War has launched OpenAI's ChatGPT Mil and Starshield AI's Grok for Government on its multi-model generative AI platform, GenAI.mil, expanding its suite of frontier AI capabilities.

Since its launch nine months ago, GenAI.mil has already onboarded over 1.7 million unique users out of the Department's more than 3 million personnel, according to a press release. Both ChatGPT Mil and Grok for Government are accredited for Controlled Unclassified Information (CUI) at Impact Level 5 (IL5).

OpenAI's ChatGPT Mil represents the adoption phase of an enterprise partnership established between the Department and OpenAI in 2025, according to a separate release on Monday. Grok for Government is a version of SpaceX's Grok frontier AI model tailored for federal use and offered under its Starshield AI branding.

The ChatGPT deployment focuses on chat, files, projects, and custom GPTs to support document-heavy unclassified work across the Department, including planning, policy, logistics, and administration, the Department said. "This deployment accelerates routine tasks and frees up time for more critical projects."

By integrating Grok into GenAI.mil, personnel will gain access to deep-thinking inference, adaptive reasoning modes, customizable workspaces, persistent projects, and reusable "playbooks" that capture and scale institutional knowledge, the Department added. "Starshield AI's Grok for Government will provide the warfighter with immediate productivity gains, stronger knowledge continuity and more secure and efficient collaboration."

Through the Chief Digital and AI Office (CDAO) and the Office of the Under Secretary of War for Research and Engineering, the integrations aim to allow the combined U.S. military forces, or Joint Force, to execute missions faster and with greater precision across operations ranging from market research analysis to supply chain management.

The Department said it will continue to scale frontier AI as a force multiplier across the Joint Force, in support of the White House's AI Action Plan.