# Microsoft Builds Its Own AI Stack — and Three New Models Prove It Means Business - slug: microsoft-builds-its-own-ai-stack-and-three-new-models-prove-it-means-business - date: 2026-04-05 - category: Artificial Intelligence Microsoft spent six years as OpenAI infrastructure partner. After a 2025 renegotiation, it can now build its own AGI — and three new MAI models are the first evidence it means to. ---