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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesMicrosoft announced an investment valued at about $135 billion, representing roughly 27% of OpenAI on an as-converted diluted basis, after OpenAI’s October 2025 recapitalization. The related $250 billion figure is different: OpenAI agreed to purchase additional Azure services from Microsoft, not to make an equity investment or pay that amount upfront. Microsoft later said its proportionate ownership had decreased, and the reviewed filing excerpt does not state its exact current percentage.
Why did Microsoft get a 27% stake in OpenAI?
The stake was part of the companies’ October 28, 2025, arrangement following OpenAI’s recapitalization. Microsoft said its investment was valued at approximately $135 billion and represented roughly 27% of OpenAI Group PBC on an as-converted diluted basis. That calculation included all owners, including employees, investors and the OpenAI Foundation. Microsoft’s announcement described the post-recapitalization terms.
“As-converted diluted” is an ownership measure that accounts for securities that could convert into ownership interests and dilutes the percentage across the relevant holders. The 27% was therefore a snapshot under the announced capitalization terms—not a promise that Microsoft’s percentage would stay fixed as OpenAI raised funds or its ownership structure changed.
What does OpenAI’s $250 billion Azure commitment mean?
OpenAI contracted to purchase an additional $250 billion in Azure services. This is a commitment to buy cloud computing services, not a $250 billion equity contribution, and the announcement did not describe it as an immediate cash payment. The commitment is a commercial obligation tied to Azure services; it should not be added to Microsoft’s stated $135 billion investment as if both amounts bought ownership.
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The same October announcement said Microsoft gave up its right of first refusal to be OpenAI’s compute provider. That change matters because it removed Microsoft’s contractual priority over competing providers, even as Azure remained central to the partnership.
Does Microsoft still own 27% of OpenAI?
Not necessarily. Microsoft’s FY2026 Form 10-K said its proportionate ownership decreased during the year because of the recapitalization and other funding activity. The reviewed excerpt does not give an updated exact percentage, so 27% should be described as the figure Microsoft announced after the October 2025 recapitalization—not as a verified current stake. Microsoft’s FY2026 annual report is the relevant filing.
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The April 2026 partnership amendment changed commercial and product terms; it did not, by itself, publish a new exact ownership percentage. Without a later explicit disclosure, a current percentage cannot be stated reliably.
Can OpenAI use cloud providers other than Azure?
Yes. Under the April 27, 2026 amendment, Microsoft remained OpenAI’s primary cloud partner, and OpenAI products would ship first on Azure subject to a capability exception. But OpenAI could serve its products to customers across cloud providers. Azure-first shipping is not the same as an Azure-only distribution rule.
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The distinction is between Microsoft’s preferred role in the partnership and OpenAI’s ability to distribute products through other clouds. The companies’ February 27, 2026 joint statement had described the then-current terms, including Azure’s exclusive role for stateless OpenAI APIs; that statement predates the April amendment and is no longer the latest description of the arrangement.
How did the April 2026 amendment change the partnership?
The October 2025 recapitalization terms and April 2026 amendment represent different snapshots. The April changes modified cloud access, IP licensing and revenue sharing; they do not supply a revised exact ownership percentage.
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| Term | October 2025 announcement | April 2026 amendment |
|---|---|---|
| Microsoft ownership | Roughly 27%, valued at approximately $135 billion, on an as-converted diluted basis after recapitalization. | No new exact percentage stated; Microsoft later reported a decrease during FY2026. |
| Cloud relationship | OpenAI committed to purchase an additional $250 billion in Azure services; Microsoft relinquished its right of first refusal over compute. | Microsoft remained primary cloud partner; OpenAI products ship first on Azure subject to a capability exception, and OpenAI may serve products across clouds. |
| IP license | Microsoft’s license was exclusive under the then-current terms. | Microsoft’s IP license became non-exclusive through 2032. |
| Revenue share | Revenue-share payments operated under the earlier partnership terms. | Microsoft stopped paying OpenAI; OpenAI’s payments to Microsoft continue through 2030, subject to a total cap. |
The amended terms make the partnership less exclusive in some ways without ending Microsoft’s strategic role. Microsoft retains a primary cloud position and a license to OpenAI intellectual property through 2032, but that license is no longer exclusive and OpenAI can serve customers on other clouds. The revenue-share direction also became asymmetric: Microsoft no longer pays OpenAI, while OpenAI’s payments to Microsoft continue through 2030 subject to a cap. The companies’ April 2026 statement sets out the amended terms.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do the Azure commitment and Microsoft’s cloud figures tell investors?
Microsoft said on its FY2026 Q4 earnings call that commercial bookings grew 10% and 11% in constant currency, including OpenAI Azure commitments. It also reported more than $214 billion in full-year Microsoft Cloud revenue, with nearly 90% coming from customers outside frontier model companies. These are Microsoft-reported figures; the $214 billion is Microsoft Cloud revenue, not OpenAI revenue. Microsoft’s FY2026 Q4 earnings materials provide the company’s reporting.
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- Work at the speed of your ideas – Built with the latest Qualcomm Snapdragon X2 Elite (12 Core) processors, Surface Laptop delivers fast, AI‑accelerated performance—making it the most powerful Surface laptop for everything from multitasking to demanding workloads.
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The figures put the OpenAI agreement in context: it is a large cloud-services commitment, but Microsoft’s cloud business is not solely dependent on frontier AI companies. CEO Satya Nadella said on the same call, “At the end of the day, every firm is going to evaluate who are the providers who are helping them with their outcomes and their knowledge creation.”
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