Microsoft recorded $10 billion in revenue from OpenAI

Microsoft says it booked $10 billion from commercial arrangements with OpenAI in the quarter ended September 30, nearly 11% of its $92.3 billion in total revenue. For all of fiscal 2026, the figure was $24.1 billion. At this pace, OpenAI-related revenue would run around $40 billion a year.

The filing also shows OpenAI owed Microsoft $7.2 billion at quarter end, up from $6 billion in June, and that Microsoft's stake in OpenAI slipped to about 24%. The two companies increasingly sell to the same customers. The money says they still need each other.

The headline story of the past year has been the loosening of this partnership. Microsoft gave up its exclusive hold in October 2025, OpenAI got freedom to use other clouds, and the two now compete for enterprise buyers. The filing tells a different story underneath. Roughly one dollar in nine that Microsoft earned last quarter traces back to OpenAI.

I read that as good news for AI demand being real. Somebody is paying for all that compute, and a lot of it flows through Azure. OpenAI committed to buy an additional $250 billion in Azure services as part of the 2025 deal, so this line has a long runway.

But concentration is a risk, and it is worth saying out loud. When one customer is this large, its fortunes become your fortunes. The rising receivables are a small flag: they reflect money owed for past transactions, not new revenue, and a growing balance from a single counterparty is the kind of number analysts should keep an eye on. We don't know how much of the $10 billion is revenue-sharing versus cloud services, because Microsoft hasn't broken it out, and TechCrunch says it asked.

There is also the competitive tension. OpenAI reportedly shares 20% of its revenue with Microsoft, though neither company has confirmed that figure, and an April 2026 agreement keeps sharing in place through 2030, subject to a cap. So every enterprise deal OpenAI wins against Microsoft's own Copilot may still put money in Microsoft's pocket. That is a strange position for both companies, and it shapes how hard either one can push.

Where this leads if it holds: the AI economy runs through a handful of tightly linked balance sheets. That is efficient while the money flows and fragile if it stops. We'll be watching the next filings for a split between cloud and revenue share, and for any change in the stake.

Microsoft's fiscal year starts in July, so the September quarter is the first quarter of fiscal 2027. Its stake in OpenAI was roughly 27% after the October 2025 recapitalization, about 25% in June, and 24% in September; Microsoft did not say what caused the dilution. Microsoft invested more than $13 billion in OpenAI under the earlier deal.