Microsoft's AI business leans heavily on OpenAI, according to a new report from Bloomberg. The technology giant pulled in $24.1 billion in AI revenue from its partnership with OpenAI in the fiscal year ending June 2026. That sum represents roughly 70% of Microsoft's total AI revenue, a figure that underscores how central the AI lab has become to the company's bottom line.
The numbers come from a Bloomberg report, covered by The Decoder in an article written by Matthias Bastian. The report paints a picture of a company whose AI ambitions are closely tied to a single partner, even as Microsoft publicly pushes for a more open AI ecosystem.
A $37 Billion Run Rate
Microsoft's CEO, Satya Nadella, said in late March 2026 that the AI business was on track to top $37 billion annually. That claim, reported at the time, suggests a steep growth curve. The $24.1 billion figure for the fiscal year ending June 2026 is a large chunk of that trajectory, but it also reveals a concentration risk. If OpenAI's contribution were to shrink, Microsoft's AI revenue picture would change dramatically.
Under the agreement between the two companies, OpenAI pays Microsoft for computing power, model development costs, and a revenue share. That arrangement means Microsoft profits directly from OpenAI's success, but it also ties the two firms together financially. The report does not specify how much of the $24.1 billion comes from each payment stream.
A Shift in Messaging
Microsoft has been championing open-weight models and warning against a few proprietary AI models capturing industry value. That stance is notable for a company historically known for vendor lock-in. The report suggests this messaging may be shaped by Microsoft's financial dependence on OpenAI.
Nadella has criticized AI labs like OpenAI and Anthropic for opposing distillation. Distillation is the practice of training models on proprietary model outputs to build competitors with less effort. It is a controversial technique in AI development, and Chinese manufacturers have reportedly been especially aggressive with it. Nadella's criticism puts him at odds with partners and rivals alike, even as Microsoft benefits from OpenAI's proprietary work.
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A Strategic Tension
The report implies a strategic shift in Microsoft's public stance, driven by its reliance on OpenAI. On one hand, Microsoft is a major investor and infrastructure provider for OpenAI. On the other, it is pushing for open-weight models and warning about the dangers of concentrated AI power. That tension is hard to reconcile, and the Bloomberg report suggests it stems from financial reality.
Microsoft has been steadily swapping in its own AI models across Office products. That move could reduce its dependence on OpenAI over time, but the $24.1 billion figure shows how far it has to go. The company's AI revenue is not diversified yet, and its public messaging may reflect that vulnerability.
What the Numbers Mean
The $24.1 billion in OpenAI-related revenue is a massive sum by any standard. It is more than many companies earn in total. But it also means that if OpenAI stumbled, Microsoft's AI story would lose most of its financial weight. The $37 billion annual run rate Nadella cited in late March 2026 suggests confidence, but the concentration risk remains.
The report does not say whether Microsoft expects the OpenAI share to shrink or grow. It only documents the current state. For now, Microsoft's AI revenue is OpenAI's revenue, and that is a fact the company cannot easily escape.