Microsoft Made $10 Billion From OpenAI in a Single Quarter

Microsoft generated $10 billion in revenue from its commercial arrangements with OpenAI in the quarter ended September 30, the company disclosed in a regulatory filing on Wednesday. That single-quarter figure represents nearly 11% of Microsoft's total quarterly revenue of $92.3 billion, and it quantifies, for the first time at this scale, the financial tether that still binds the two companies even as they compete for the same customers.

The number lands amid a broader restructuring of one of the AI industry's defining partnerships. Microsoft and OpenAI spent 2025 and 2026 loosening the terms of what was once an exclusive alliance, and the filing shows the decoupling has not yet dented the money flowing between them.

How big is the OpenAI money stream?

The quarterly figure is not an outlier. For Microsoft's full 2026 fiscal year, revenue from OpenAI reached $24.1 billion, according to the filing. At the latest quarterly pace, Microsoft would pull in $40 billion annually from OpenAI-related arrangements — a run rate that exceeds the annual revenue of many Fortune 500 companies.

Microsoft's financial year begins in July, which makes the quarter ended September 30, 2026 the first quarter of its fiscal 2027. The $10 billion therefore opens a new fiscal year on a note that would have been unimaginable when Microsoft made its first investment in the AI lab.

The filing also reveals a growing balance on the other side of the ledger. Microsoft reported $7.2 billion in outstanding receivables from OpenAI at the end of September, up from $6 billion at the end of June. That money represents amounts OpenAI owes Microsoft for previous transactions, not additional revenue. The $1.2 billion increase over a single quarter signals that OpenAI's obligations to Microsoft are still accumulating faster than they are being settled.

What is driving the revenue?

The exact composition of the $10 billion remains unclear. Microsoft did not break down how much came from revenue-sharing payments versus Azure cloud computing services, and TechCrunch, which first reported the filing, said it had reached out for more information.

One data point exists. In November 2025, TechCrunch reported, citing leaked documents, that Microsoft had received $865.8 million in net revenue-sharing payments from OpenAI during the first nine months of that year. If that pace held, revenue sharing alone would account for a small fraction of the current quarterly total — implying that Azure consumption by OpenAI, which trains and serves its models on Microsoft's cloud infrastructure, likely constitutes the majority of the arrangement's value.

The revenue-sharing mechanism itself dates to the earlier era of the partnership. OpenAI reportedly shares 20% of its revenue with Microsoft under a previous deal in which the software giant invested more than $13 billion in the startup. Neither company has publicly confirmed that percentage.

Why does the deal run through 2030?

The revenue sharing has a firm end date on paper. Under an April 2026 agreement, OpenAI is obligated to continue sharing revenue with Microsoft through 2030, subject to a cap — even as OpenAI is now free to work with competing cloud providers.

That April accord built on an earlier and more consequential break. In October 2025, the companies began loosening the ties of their once-exclusive partnership when Microsoft relinquished its hold on OpenAI, giving the startup more freedom to partner with other cloud providers. The freedom came at a price. In exchange, OpenAI committed to buying an additional $250 billion in Azure services as part of the October 2025 agreement.

That $250 billion commitment explains much of the revenue picture in Wednesday's filing. OpenAI's compute needs — training frontier models and serving hundreds of millions of users — convert directly into Azure revenue for Microsoft, making the startup simultaneously a customer, a partner and, increasingly, a rival.

What is happening to Microsoft's stake?

Microsoft's ownership in OpenAI is shrinking, gradually and without explanation from the company. The filing shows the stake declined from about 25% in June to 24% in September. That continues a longer slide from roughly 27% following the October 2025 recapitalization, the transaction that restructured the partnership and allowed OpenAI to pursue other cloud vendors.

Microsoft did not specify what caused the dilution. The pattern is consistent with a company that is converting direct control into contractual guarantees — revenue through 2030, a $250 billion Azure commitment — while steadily reducing its equity exposure.

Why does the filing matter beyond these two companies?

The disclosure gives investors and competitors the clearest picture yet of how much of Microsoft's growth now rides on a single AI customer. Nearly 11% of quarterly revenue from one counterparty is a concentration risk that cuts both ways: Microsoft depends on OpenAI's continued scale, and OpenAI depends on Microsoft's infrastructure to operate.

The stakes extend to the broader cloud and AI market. OpenAI can now place workloads with rival providers, which means the Azure commitment will be tested against pricing and performance from competitors over the life of the deal. Microsoft, meanwhile, has committed its own capital to building out AI datacenter capacity sized partly around OpenAI's demand.

The filing also reframes the competitive dynamic. The two companies increasingly chase the same enterprise customers with AI products — Microsoft through Copilot and its own models, OpenAI through ChatGPT and its business offerings — yet Microsoft's income statement now benefits directly from OpenAI's commercial success via the revenue share and the Azure spend.

Whether the $40 billion annual run rate holds will depend on the cap built into the April 2026 agreement and on how OpenAI distributes its compute across providers in the years before 2030, when the revenue-sharing obligation expires.