This benchmark models the true cost of deploying each of the four major AI platforms across an organization of 1,000 to 4,000 employees, for basic-to-intermediate use cases: drafting and editing documents, summarizing meetings and threads, analyzing spreadsheets, light coding assistance, and day-to-day research. It is not modeling heavy agentic automation, high-volume API workloads, or custom-built AI products — those change the math substantially, mostly upward. Methodology