Microsoft's AI Revenue Mostly Comes From OpenAI, New Disclosures Reveal

Summary

Microsoft has disclosed that it generated $24.1 billion in revenue from OpenAI during its fiscal year ended June 2026, accounting for approximately 70% of the company's total AI revenue. The disclosure, which emerged in a recent SEC filing, reveals that Microsoft's annual AI sales run rate was estimated at roughly $34 billion based on 123% quarterly growth, making OpenAI's contribution overwhelming. Under their revenue-sharing agreement, OpenAI pays Microsoft for cloud computing resources and AI infrastructure while Microsoft receives a portion of OpenAI's revenue—a structure that has kept Microsoft highly dependent on its strategic partner despite efforts to diversify through investments in competitors like Anthropic and development of proprietary AI models.

The timing of the disclosure has raised speculation that it may be connected to OpenAI's anticipated initial public offering. While Microsoft's overall AI business represents less than 10% of the company's $51 billion in commercial bookings, OpenAI's contribution has driven most of the AI segment's recent growth. This revelation highlights ongoing uncertainty among investors about the composition of Microsoft's AI revenue—specifically, how much stems from infrastructure and cloud services provided to OpenAI versus returns on Microsoft's strategic investment in the company. Analysts remain divided on whether this dependency structure is favorable for Microsoft long-term.

• Investors question whether Microsoft's AI revenue comes primarily from infrastructure services to OpenAI or from returns on strategic investment, affecting how favorably the business is evaluated
• OpenAI's contribution drove most of the growth in Microsoft's AI business despite the segment representing less than 10% of total commercial bookings