ChatGPT Mil and Grok on GenAI.mil Now Reach 3 Million Users
DefenseScoop and TechCrunch reported Monday that OpenAI's ChatGPT Mil and Starshield AI's Grok for Government have been added to GenAI.mil, the Pentagon's enterprise AI portal. The platform serves roughly 3 million users across the armed forces and civilian workforce. All three models now on the portal (ChatGPT Mil, Grok for Government, and Gemini for Government) hold Impact Level 5 (IL5) approval, the security threshold for sensitive unclassified data.
The Hill reported that the portal went live in December 2025, and Gemini for Government was the sole model for eight months. An executive order renamed the Department of Defense the Department of War, and that department operates the platform. ChatGPT Mil is OpenAI for Government's product, built on the GPT-5.4 and GPT-5.6 Terra models; it is cleared for controlled unclassified information.
ChatGPT Mil and Grok on GenAI.mil: A Multi-Vendor Push
The expansion gives defense units a choice of AI tools adapted for military missions and reduces dependence on a single vendor. With three suppliers on one procurement channel, the department can compare performance side by side across a user base larger than most enterprise software rollouts.
Anthropic's Claude has no slot on GenAI.mil. Anthropic declined to grant the Pentagon unrestricted use of its models and insisted on safety guardrails, and the Trump administration then designated the company a supply-chain risk. Anthropic is challenging that designation in court. The dispute makes model terms of use a procurement matter: vendors must obtain IL5 approval and meet usage conditions the Pentagon will accept to reach this customer base.
The three authorized models on the portal:
| Model | Provider | Model lineage | Added |
|---|---|---|---|
| ChatGPT Mil | OpenAI | GPT-5.4, GPT-5.6 Terra | August 31, 2026 |
| Grok for Government | Starshield AI | Grok frontier models | August 31, 2026 |
| Gemini for Government | Gemini | December 2025 |
Why this matters
GenAI.mil is now one of the largest enterprise AI deployments in the world, and its three-vendor structure shows how the U.S. government intends to buy frontier AI: from multiple suppliers, IL5-cleared, and adapted to missions. For AI labs, the price of entry is clear: security clearance plus usage terms the Pentagon will accept. For the roughly 3 million people on the portal, the payoff is a real choice among three frontier assistants for sensitive unclassified work; Claude's absence keeps the unresolved tension between safety terms and government access in view.
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Researched and cross-referenced against primary sources by the Bytevyte editorial team. This article was generated with the assistance of artificial intelligence and reviewed by the Bytevyte editorial team.