Microsoft reportedly threatens to sue OpenAI and Amazon over $50 billion AWS deal

The partnership between Microsoft and OpenAI dates back to 2019, when the Redmond giant invested $1 billion into the Sam Altman-led AI company. The initial investment was made with the goal of supporting the development of artificial general intelligence (AGI). Now, in 2026, OpenAI is among the top AI companies in the world, which also means the business dynamics between the two AI juggernauts have changed massively. However, back in mid-2025, Satya Nadella said that the partnership is still strong.

Last month, when Amazon announced its plan to invest $50 billion in OpenAI, both Microsoft and OpenAI shared a joint statement about where the partnership is heading. At the time, the announcement mentioned, “Azure remains the exclusive cloud provider of stateless OpenAI APIs. Microsoft is the exclusive cloud provider for stateless APIs that provide access to OpenAI’s models and IP… Any stateless API calls to OpenAI models that result from a collaboration between OpenAI and any third party—including Amazon—would be hosted on Azure.”

Microsoft reportedly warns OpenAI & Amazon of legal action following the recent AWS deal

While all seemed pretty good between Microsoft and OpenAI, a new report by Financial Times has made some bombshell revelations. Per the report, Microsoft is reportedly considering legal action against Amazon and OpenAI over a $50 billion cloud deal that may conflict with its Azure exclusivity agreement (via Reuters).

At the center of the dispute is whether AWS can host OpenAI’s “Frontier” product without breaching a clause that requires all API access to go through Microsoft’s cloud. The report, citing people familiar with discussions, notes that Microsoft executives have argued that the proposed workaround “would violate the spirit, if not the letter, of their agreement.”

A person familiar with Microsoft’s position stated, “We know our contract. We will sue them if they breach it. If Amazon and OpenAI want to take a bet on the creativity of their contractual lawyers, I would back us, not them.” Meanwhile, OpenAI and Amazon maintain that their approach complies with existing terms. Their plan involves a “Stateful Runtime Environment” on AWS, which is designed to add memory and context to AI systems without directly exposing core models via APIs.

Immediate legal action is unlikely, though

Microsoft, however, remains unconvinced, with internal experts reportedly doubting the feasibility of avoiding Azure under current contractual limits. Despite the tension, immediate legal action appears unlikely, according to the report. Microsoft is already under scrutiny in multiple regions, so it might prefer to settle things behind closed doors rather than moving to the courtroom.

On the other hand, OpenAI, which is already dealing with multiple lawsuits, also wouldn’t want yet another lawsuit, that too from Microsoft. Another person close to the matter noted, “The last thing OpenAI needs is another court case right now.” Microsoft has also reinforced its stance publicly, saying, “We are confident that OpenAI understands and respects the importance of living up to [its] legal obligation.”