Pentagon Adds ChatGPT and Grok to GenAI.mil — Now Past 1.7 Million Users
The Pentagon's unified generative AI portal, GenAI.mil, has added OpenAI's ChatGPT Mil and xAI's Grok for Government, joining Google Gemini to offer three AI models.
On August 31, 2026, the US Department of Defense (now the Department of War) announced it had added OpenAI’s ChatGPT Mil and Grok for Government from xAI subsidiary Starshield AI to its in-house generative AI portal, GenAI.mil. First opened in December 2025 with Google Gemini, the portal now offers three AI models, with more than 1.7 million of the department’s 3 million personnel already registered.
What is GenAI.mil
GenAI.mil is a unified portal that lets Defense Department military, civilian, and contractor personnel safely use commercial generative AI for unclassified work. It launched in December 2025 with Google Cloud’s Gemini for Government, and now offers two additional models, expanding user choice.
The two newly added models
| Model | Provider | Official DoD description |
|---|---|---|
| ChatGPT Mil | OpenAI | Specialized for document-heavy unclassified work — planning, policy, logistics, and administration |
| Grok for Government | xAI / Starshield AI | Deep-thinking inference, adaptive reasoning modes (Auto, Fast, Expert), and reusable “playbooks” that capture and scale institutional knowledge |
Why it matters
This expansion shows the US government rapidly adopting commercial AI models for real defense work. It’s happening alongside — not instead of — EO 14409’s national security review process for frontier AI models: the same models being screened for national security risk are simultaneously being pulled into active government use once they clear that bar.
Limitations and caveats
- The figures (1.7 million users) and feature descriptions in this article reflect the Defense Department’s and press reports as of August 31, 2026; both are likely to keep changing.
- ChatGPT Mil and Grok for Government are separate, government-specific versions distinct from the consumer ChatGPT and Grok, and may differ in security posture and data handling.
- This announcement covers unclassified work only; it says nothing about classified information handling.
Conclusion
The expansion of GenAI.mil shows commercial AI models rapidly becoming part of daily operations at government and defense organizations. Moving from a single-model (Gemini) setup to a three-model lineup that now includes ChatGPT and Grok gives Defense Department personnel the ability to pick an AI suited to the task at hand.