Pentagon Adds ChatGPT and Grok to GenAI.mil Platform
Gemini is no longer alone: ChatGPT Mil and Grok for Government join a Pentagon platform that reports 1.7 million users, while Claude stays out.
Symbolic image: in a military operations center, a person seen from behind slides a module into a server rack while status lights and a console screen with abstract diagrams glow.
The Pentagon has added OpenAI's ChatGPT Mil and xAI's Grok for Government to GenAI.mil, the internal AI platform that had offered only Google's Gemini since its launch in December 2025.
At a glance
- New on GenAI.mil: ChatGPT Mil from OpenAI and Grok for Government from xAI.
- Google's Gemini had been the platform's only model since its December 2025 launch.
- 1.7 million users across a department of more than 3 million staff and service members.
- Stated uses: administration, logistics and planning; procurement and supply chain work.
- Claude is absent; a court called the supply chain risk designation unlawful in late August 2026.
The Department of Defense has widened its in-house AI platform, GenAI.mil, to carry two more models: ChatGPT Mil from OpenAI and Grok for Government from xAI. Until now Google's Gemini was the only option there, dating back to the platform's launch in December 2025. The report puts usage at 1.7 million people inside a department of more than 3 million employees and service members.
Different jobs for each model
ChatGPT Mil is pointed at administrative work, logistics and planning. Grok is framed around procurement analysis and supply chain management. Those are the priorities the department is presenting rather than a technical boundary between what each system can do.
Walled off from the consumer versions
Both models run in a dedicated secure environment kept separate from the commercial products, so that sensitive government material stays inside. On the same account, no user data is collected. The report does not describe how that separation is engineered or independently checked.
The missing vendor
Anthropic's Claude is not on the platform. The company would not grant the Pentagon unrestricted usage rights, and the Trump administration then labeled it a supply chain risk. A court found that designation unlawful in late August 2026. Whether that opens a path onto GenAI.mil later is not addressed.
What is not established
The reporting reviewed here carries no contract values, no on-the-record quotes from named officials, and no statement of which classification levels the models are cleared for. There is also no timeline for further rollout across the department. Those gaps are left as gaps rather than filled in.
FAQ
Which AI models are available on GenAI.mil?
Google's Gemini since the December 2025 launch, now joined by OpenAI's ChatGPT Mil and xAI's Grok for Government.
How many people use GenAI.mil?
The report cites 1.7 million users within a department that counts more than 3 million employees and service members.
Why is Anthropic's Claude not on the platform?
Anthropic declined to grant the Pentagon unrestricted usage rights and was designated a supply chain risk by the administration, a label a court ruled unlawful in late August 2026.
