Microsoft has invested over $13 billion in OpenAI, which has resulted in a 27% stake in the company worth approximately $135 billion following OpenAI's recent restructuring. This partnership makes Microsoft OpenAI's exclusive cloud provider, and OpenAI is committed to spending $250 billion on Microsoft Azure services. The investment allows Microsoft to integrate OpenAI's technology into its products while also benefiting from the revenue-sharing deal.
Total investment: Microsoft's cumulative investment is over $13 billion, with $11.6 billion funded as of September 2025.
Ownership stake: Following OpenAI's restructuring, Microsoft holds a 27% stake in the company, which is valued at about $135 billion.
Azure commitment: OpenAI has committed to spending $250 billion on Microsoft Azure services over the multi-year term of the deal.
Strategic integration: Microsoft integrates OpenAI's technology into products like Bing, Azure, and Microsoft 365.
Revenue sharing: The deal includes a revenue-sharing agreement, with leaked documents showing OpenAI paid Microsoft hundreds of millions of dollars in revenue share in 2024 and the first three quarters of 2025.
Partnership dynamics: The partnership is evolving, with Microsoft recently adding OpenAI to its list of competitors, though the companies remain key partners in cloud and AI.