The Deal
Microsoft invested approximately $10B in OpenAI in January 2023, following earlier investments of $1B (2019) and $2B (2021). The deal gave Microsoft a reported 49% share of OpenAI profits (capped) and exclusive cloud hosting rights on Azure. OpenAI was valued at approximately $29B.
Strategic Rationale
Microsoft CEO Satya Nadella called this a generational opportunity to reshape every product category. The deal gave Microsoft exclusive API access to GPT-4 and subsequent models, enabling Copilot products across Office 365, GitHub, Bing, and Azure. It was designed to establish Microsoft as the platform layer for the AI era.
Impact
The investment catalyzed the enterprise AI market. GitHub Copilot, Microsoft 365 Copilot, and Azure OpenAI Service generated billions in new revenue. Microsoft market cap grew by over $1 trillion. The deal forced every major cloud provider (Amazon, Google) to secure their own model partnerships.
What Happened After
The partnership weathered the November 2023 board crisis (where Microsoft briefly offered to hire the entire OpenAI team). OpenAI subsequently raised at $157B and then $300B valuations. The exclusive relationship began to loosen as OpenAI pursued multi-cloud distribution, but Microsoft Azure remains the primary infrastructure provider.