Recently, the U.S. Department of Defense has begun offering access to two major artificial intelligence (AI) models, ChatGPT and Grok, through a secure, internal platform used by the Pentagon. These are specialized versions of the models, designed specifically for government use and integrated into the GenAI.mil platform. Earlier this year, the Pentagon added another AI model called Gemini, bringing the total number of AI tools in use to three. On September 1, 2026, the department announced the addition of two new models: ChatGPT Mil and Grok for Government, both tailored for defense needs. GenAI.mil is a restricted platform that provides access to military personnel, civilians, and contractors working within the Department of Defense. It is currently used by about 1.7 million people out of the estimated three million eligible users. The Pentagon has banned the use of public AI tools by its personnel due to concerns about privacy and security. These secure AI models are designed to handle sensitive government data without the risk of leaks to the outside world. The Pentagon’s decision to use multiple AI models is part of a broader strategy to enhance the efficiency and effectiveness of the U.S. military through AI. These tools will be used for a variety of tasks, including administrative work, logistics, strategic planning, and crisis response. Each AI model has specific strengths, allowing the military to choose the best tool for each task. For example, ChatGPT is good at processing large volumes of text, while Grok is better at analyzing data and making logical decisions. Using multiple models also helps reduce the risk of system failures or disruptions that could occur if the military relied on a single provider. Secretary of War Pete Hegseth has emphasized the importance of integrating AI into daily operations across the Department of Defense. He has called on all personnel to learn how to use the platform and incorporate it into their work routines. He believes that AI should be a key part of military operations, helping the U.S. gain an advantage over potential adversaries. The Pentagon’s approach reflects a growing recognition of AI’s role in modern warfare and national security.