For most enterprises, the journey into Generative AI begins with a credit card and an API key. But as workloads scale from experimental prototypes to production-grade systems handling 50,000+ requests per day, the "rental" model of Managed APIs (OpenAI, Azure, Google) begins to face stiff competition from "owning" the infrastructure via Open Weights models (Llama, Mistral, DeepSeek) in a colocation facility. This guide breaks down the economics of a U.S.-based enterprise depl