The Defense Department has made a significant strategic choice in its artificial intelligence vendor relationships, selecting OpenAI as a preferred partner while declining to pursue a relationship with Anthropic. The decision comes amid heightened scrutiny of AI's role in national defense and represents a notable divergence in how the Pentagon is evaluating competing AI providers. The move signals the Pentagon's confidence in OpenAI's technology and governance approach for sensitive defense applications. Anthropic, despite its strong reputation for AI safety research, did not secure the Defense Department's backing at this time. The decision reflects broader questions about how government agencies evaluate AI vendors, particularly when assessing factors beyond raw technical capability, including company structure, safety practices, and alignment with defense priorities.