Microsoft Stock Price Drops Sharply After OpenAI Revises Partnership

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OpenAI CEO Sam Altman said that the company has updated its partnership with Microsoft (MSFT), ending Azure cloud exclusivity and clearing OpenAI to sell products across competing providers.

Microsoft stock slipped on the news, with traders citing the loss of an Azure-only edge for OpenAI’s flagship artificial intelligence (AI) products.

What Changed in the Updated Partnership

Per Altman’s post, Microsoft remains OpenAI’s primary cloud partner, but the license is now non-exclusive. OpenAI can offer models through Amazon Web Services, Google Cloud, Oracle, and other rivals.

The terms keep cash flowing both ways. OpenAI will supply Microsoft with models through 2032 and pay a revenue share to its largest backer through 2030.

Microsoft will no longer pay a revenue share back to OpenAI, removing one outflow from its income statement.

we have updated our partnership with microsoft.

microsoft will remain our primary cloud partner, but we are now able to make our products and services available across all clouds.

will continue to provide them with models and products until 2032, and a revenue share through…

— Sam Altman (@sama) April 27, 2026

Why MSFT Stock Sold Off

MSFT shares dropped as much as 5% intraday before paring losses, with the chart still pointed lower into the close.

Investors had treated OpenAI workloads as a structural Azure differentiator. Removing exclusivity opens that book of business to AWS, Google Cloud, and Oracle, each of which has courted frontier AI labs.

Not every analyst read the move as bearish. CFA Palwinder Singh argued that the selloff overlooked the value Microsoft retains as the lab’s largest equity holder.

“Investors are crying about exclusivity while ignoring that Microsoft still has a 27% stake in OpenAI valued at $135 Billion, This 5% dip is a gift for anyone who can read a balance sheet instead of just a headline,” wrote Singh.

Microsoft keeps ChatGPT’s intellectual property rights through 2032 alongside that equity stake.

Investors must weigh whether discontinued payments and a longer model runway can offset the cloud-exclusivity hit across the broader AI sector, including Altman-linked projects such as Worldcoin.

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