Microsoft's OpenAI revenue hits $10 billion in a single quarter

A new pillar of revenue

Microsoft recently disclosed that its business with OpenAI generated $10 billion in revenue for the quarter ended Sept. 30. This amount represents roughly 11% of the company's total revenue for that period. The figure marks a significant jump from the previous fiscal year, where the average quarterly revenue from OpenAI was about $6 billion.

To put this growth into perspective, the $10 billion haul from OpenAI now exceeds the quarterly earnings of some of Microsoft's most established divisions. For example, the Xbox division brought in $5.4 billion during the same period. The company's search and advertising business, which includes the Bing search engine, generated $6.6 billion.

The revenue also surpasses the $3.6 billion earned from Windows licenses sold to PC makers, along with Surface and other Microsoft devices. These figures highlight how quickly the generative AI alliance has scaled. As reported by geekwire.com, Microsoft began disclosing these specific numbers because its 24% stake in OpenAI makes the company a "related party" under accounting rules.

How the partnership works

The $10 billion total includes revenue-sharing payments from OpenAI as well as other collaborative business activities. A major component of this involves OpenAI's use of Microsoft Azure, the company's cloud computing platform, to train and run its various AI models. While Microsoft did not specify the exact split, the surge in Azure's performance is closely tied to this demand.

Microsoft Azure revenue rose 48% to $33.2 billion in the quarter, exceeding the company's own forecast of 44% to 45% growth. This growth is driven by the increasing need for cloud infrastructure to power large-scale AI applications. The company provides the heavy lifting required for models to process information and interact with users.

Beyond the direct revenue sharing, Microsoft sells access to OpenAI's models to its own business customers through the Azure OpenAI Service. These models also serve as the foundation for Microsoft's Copilot products. However, the revenue from these direct sales to Microsoft's own customers is not included in the $10 billion figure.

The shift in the AI landscape

The relationship between the two companies has evolved significantly since Microsoft first invested in OpenAI in 2019. While they were once tightly bound, the companies have loosened their ties recently. OpenAI restructured as a public benefit corporation in October 2025, and Microsoft gave up its right of first refusal to supply the company's computing capacity.

Despite these changes, the financial ties remain deep. OpenAI has committed to buying an additional $250 billion in Azure services. Furthermore, an agreement from April 2026 gives OpenAI more freedom to use other cloud providers while ensuring it continues to share revenue with Microsoft through 2030. These contracts ensure that Microsoft remains a primary beneficiary of OpenAI's success.

Microsoft is also diversifying its AI portfolio to reduce its singular focus on OpenAI. The company now builds its own models and offers models from other providers like Anthropic. This multi-model approach allows Microsoft to offer customers tools that route tasks to whichever AI model handles a specific job best, whether it be coding or general text generation.

Risks and future outlook

With the rapid growth of AI, Microsoft has updated its quarterly filings to include new risk language regarding external providers. The company noted that it has "limited visibility into or control over" how models from partners like OpenAI and Anthropic are designed, trained, secured, and tested. This highlights a potential vulnerability in relying on third-party technology for core products like Copilot.

The filing also warns that because some of these AI partners are also significant customers of Azure, the benefits of these relationships might not be sustained. These partners could choose to buy less capacity or change their pricing structures. Microsoft also noted that it may have to change how it allocates its own scarce data center capacity in response to these shifting dynamics.

Looking ahead, CEO Satya Nadella emphasized that the goal is to achieve broad adoption across many businesses rather than relying on a few large customers. He described the AI transition as a "decade-long thing" and expressed a desire for competition between models. By encouraging customers to use multiple models for different tasks, Microsoft aims to build a more resilient and diverse AI ecosystem.