OpenAI cuts a deal with Microsoft to sell on AWS—and it’s weirdly good for both

OpenAI just pulled off something I honestly didn’t think was possible: it convinced Microsoft to let it sell products on AWS.

For years, OpenAI was locked into Azure as its exclusive cloud provider. That was part of the deal when Microsoft poured billions into the company. But that arrangement was becoming a liability—not just for OpenAI, but for Microsoft too.

The old setup meant any company already on AWS had to either migrate workloads to Azure or skip OpenAI’s models entirely. That’s a non-starter for most enterprises. Meanwhile, Amazon was busy building its own AI models (Nova, Titan) and investing in Anthropic. OpenAI was effectively ceding ground to competitors.

So what changed? Money, mostly.

Under the new terms, Microsoft gets a bigger cut of OpenAI’s revenue in exchange for releasing OpenAI from the exclusivity clause. I’ve seen some reports suggesting the revenue share could be as high as 30-40% on AWS sales, though neither side is confirming numbers. That’s a lot, but it’s better than the zero revenue Microsoft was getting when customers chose Anthropic over OpenAI because of cloud lock-in.

For Microsoft, this is actually a smart move. The antitrust scrutiny around its OpenAI investment was getting uncomfortable. Regulators in the EU and UK were poking around, and a formal investigation would have been a headache. By voluntarily opening up the relationship, Microsoft can argue it’s not trying to monopolize AI infrastructure. Whether regulators buy that is another question, but it’s a better look than fighting them.

For OpenAI, the upside is obvious. AWS is the biggest cloud platform by market share. Being able to sell GPT-5 (or whatever they’re calling it now) directly to AWS customers removes a massive growth ceiling. AWS also has better enterprise sales relationships in certain verticals—financial services, healthcare—where Azure has historically been weaker.

There’s also the Amazon angle. Amazon and OpenAI have had a frosty relationship at best. Amazon invested billions in Anthropic and built its own models. But money talks. If AWS can resell OpenAI models and take a cut, Amazon might actually prefer that to competing head-on. I doubt Amazon will drop Anthropic, but having OpenAI available on AWS makes the platform more attractive for customers who want choice.

The timeline here matters. This deal reportedly closes around the same time as OpenAI’s massive $50 billion funding round, which includes participation from… SoftBank, MGX, and others. Microsoft is reportedly not leading this round, which tells you something about how the relationship is evolving. Microsoft is moving from “primary investor” to “preferred partner with a revenue share.”

One thing that bugs me: the exclusivity clause was supposed to be OpenAI’s main leverage over Microsoft. In exchange for giving it up, OpenAI got… what exactly? More money from Microsoft? A promise not to compete? The details are murky. If OpenAI gave up exclusivity without getting something substantial in return, that’s a mistake. But given Sam Altman’s track record, I suspect there are concessions we haven’t heard about yet.

The bottom line: this deal makes the AI cloud market more competitive, which is good for everyone except maybe Google Cloud, which now has to compete with both Azure and AWS offering top-tier models. AWS gets a new revenue stream, Microsoft reduces regulatory risk, and OpenAI gets access to a customer base it couldn’t reach before. Not bad for a Tuesday.