Microsoft will now buy GPU compute from Mistral's European fleet, reversing their 2024 roles when Microsoft rented Azure to the startup. Under an expanded, multibillion-dollar partnership, Microsoft will draw on Mistral's Europe-based GPU infrastructure, which the startup is building out with thousands of the latest NVIDIA Vera Rubin accelerators, to serve its own customers, while placing Mistral's newest models inside the software Microsoft sells to banks, hospitals, and defense agencies. Neither company put a number on the deal. On the model side, Mistral's Medium 3.5 and OCR 4 arrive in Microsoft Foundry and Copilot Studio, deployable in public cloud, Azure Local, or fully disconnected environments. The target is regulated buyers needing data residency and operational control. The deal's value, the Vera Rubin timeline, and inference pricing are all undisclosed.