Microsoft and OpenAI issue rare partnership reassurance after $110b funding surprise

Microsoft and OpenAI issued a rare joint statement last week. The clarification arrived just hours after OpenAI announced a record-shattering $110 billion funding round led by Amazon, Nvidia, and SoftBank. Analysts initially interpreted the deal as OpenAI attempting to decouple from Microsoft’s cloud dominance.

The joint memo emphasizes that the core pillars of their relationship remain "unaltered," specifically protecting Microsoft’s exclusive cloud rights and revenue-sharing interests even as OpenAI expands its stable of backers.

The "insurance policy" statement

The statement was meticulously crafted to reassure investors that Microsoft still holds the "keys" to OpenAI's commercial engine.

Azure exclusivity: The companies confirmed that Azure remains the exclusive cloud provider for all "stateless" OpenAI API calls. Crucially, this means that even if a developer uses OpenAI’s technology through an Amazon AWS integration, the actual computing work is still routed through and billed by Microsoft Azure.

The revenue moat: Microsoft’s existing revenue-share agreement remains intact. Because this agreement was designed to include profits from third-party cloud partnerships, Microsoft will effectively "earn a cut" of OpenAI’s new business with Amazon.

IP rights: Microsoft retains its exclusive license to OpenAI’s intellectual property (IP), including all models developed up until the achievement of Artificial General Intelligence (AGI).

Why the clarification?

The need for a joint statement arose from the sheer scale of OpenAI’s new deal with Amazon, which includes:

• $50 billion from Amazon: The largest single investment in the $110 billion round, which values OpenAI at a staggering $840 billion.

• Trainium integration: OpenAI agreed to use two gigawatts of computing capacity powered by Amazon’s in-house Trainium chips. This is a significant shift, as OpenAI has historically relied almost entirely on Nvidia chips hosted on Microsoft servers.

• Enterprise expansion: OpenAI will now co-develop a new generation of enterprise products with AWS, moving into direct competition with some of Microsoft’s own Copilot offerings.

"Always contemplated" under the 2025 pact

Microsoft and OpenAI were quick to point out that this diversification was not a betrayal, but a feature of their October 2025 agreement.

The 2025 contract was specifically designed to give both companies "room to pursue opportunities independently." As OpenAI scales toward its massive Stargate infrastructure goals, it requires more compute than any single provider can offer.

The joint statement also reiterated that the contractual definition of AGI, and the process for determining when it has been reached via an independent expert panel, remains unchanged.

"Our partnership remains strong and central," the companies wrote. "It was designed to give both Microsoft and OpenAI room to pursue new opportunities independently while continuing to collaborate, which each company is doing together and independently."