Microsoft’s record $120 billion+ FY2026 infrastructure investment primarily serves just two customers: OpenAI and Microsoft’s own Copilot products.
Customer 1: OpenAI
- 700M+ weekly ChatGPT users
- $250B Azure commitment
- Dedicated Fairwater facilities (Wisconsin, Georgia)
- GPT-5 and o3 model training
Customer 2: Microsoft Internal
- 15M M365 Copilot paid seats
- 4.7M GitHub Copilot subscriptions
- $30/user/month premium pricing
- Highest-margin AI consumption in portfolio
The Concentration Risk
CFO Amy Hood noted that GPUs are deliberately prioritized for Copilot products: “If I had taken the GPUs that came online in Q1 and Q2 and allocated them all to Azure, the KPI would have been over 40%.”
The Diversification Push
Microsoft is actively expanding its third-party enterprise layer — signing Anthropic ($30B), Nebius ($17.4B through 2031), and hosting 1,500+ multi-model customers.
This is part of a comprehensive analysis. Read the full analysis: Microsoft’s Frontier AI Dilemma on The Business Engineer.









