Pentagon Adds ChatGPT and Grok to Military AI Platform

The Pentagon has expanded its military AI platform to include specialized versions of ChatGPT and Grok, marking a significant push to integrate commercial AI tools into defense operations.

The Department of War announced Monday that both services are now available through GenAI.mil, the military's custom AI platform that launched in December with only Google's Gemini. The platform already serves 1.7 million users across the department's 3 million-strong workforce of military personnel and civilians, according to Fortune.

The additions follow defense contracts worth up to $200 million each awarded to OpenAI and Elon Musk's SpaceXAI, which operates Grok. Google and Anthropic also received contracts at that time, though Anthropic's Claude remains notably absent from the platform following a public dispute with War Secretary Pete Hegseth.

How the military versions work

ChatGPT Mil, part of OpenAI's broader OpenAI for Government initiative launched last summer, operates within a secure environment tailored for military needs. The system keeps data isolated and does not use it for model training. Service members can deploy both ChatGPT Mil and Grok for Controlled Unclassified Information at Impact Level 5, which covers sensitive but unclassified government data.

"ChatGPT on GenAI.mil will make unclassified work throughout the Department more efficient, freeing up time and resources so DoW personnel can focus on the mission," said Joe Larson, OpenAI's vice president and head of government.

The military version of Grok provides deep-thinking inference capabilities and multiple reasoning levels—auto, fast, and expert. Pentagon officials say it will help personnel "execute missions faster and with greater precision" across functions from acquisition market research to supply-chain management.

Why it matters

The vast majority of military work involves unclassified, document-intensive tasks in human resources, logistics, and contracting—precisely the areas where large language models excel at processing information. By deploying commercial AI at scale, the Pentagon aims to free personnel from routine administrative work to focus on core mission activities. The move reflects the White House's AI Action Plan directive that "The United States must aggressively adopt AI within its Armed Forces if it is to maintain its global military preeminence."

Rocky rollout and political tensions

The GenAI.mil platform's December launch drew criticism for its execution. DefenseScoop reported that some personnel initially mistook the rollout's pop-up notification—styled with "I want YOU to use AI"—for a cyberattack. Concerns only subsided after Hegseth circulated a memo declaring "The future of American warfare is here, and it's spelled AI" and ordering every department member to "log in, learn it, and incorporate it into your workflows immediately."

The Anthropic situation adds a political dimension to the Pentagon's AI adoption. After the company pushed for contractual guarantees that its technology would not be used for autonomous weapons or surveillance, Hegseth publicly criticized AI models that "won't allow you to fight wars." President Donald Trump subsequently directed federal agencies to stop using Anthropic's technology, and Hegseth designated the company a supply-chain risk. A judge ruled last week that this designation was unlawful. Anthropic has filed suit over the matter.

The details were first reported by Fortune.