❯ Amazon Completes $50 Billion OpenAI Investment — Final $35 Billion Clears This Week, ~5% Stake

FINAL TRANCHEFilings show Amazon has fully paid its $50 billion investment in OpenAI, with the final $35 billion clearing this week, triggered by OpenAI hitting undisclosed performance milestones. According to people familiar with the matter, that raises Amazon’s stake in OpenAI to about 5%. When the investment was announced on February 27, only $15 billion was paid upfront; the remaining 70% was always contingent.

ROUND TRIPNeither side has said exactly which milestones unlocked the money. For context: the funds are part of OpenAI’s $110 billion funding round, with SoftBank and Nvidia each contributing $30 billion. Around the same time, Amazon and OpenAI also expanded their existing cloud contract by $100 billion with an eight-year term. In other words, the money takes a lap through Amazon’s books, and a large share flows back in the form of compute bills. For AWS, this is Microsoft’s old “investment-for-usage” playbook copied outright — just with much bigger stakes. It is also the financial firepower that let OpenAI announce this week that users topped one billion while cutting GPT-5.6 Luna’s price by 80%.

THE MATHThe ~5% stake buys more than equity. Amazon gets a long-term contract that locks the priciest batch of inference workloads into its own cloud; OpenAI gets a compute credit it doesn’t have to monetize immediately. The one truly repositioned by this money is Microsoft — it is no longer OpenAI’s sole compute backstop. Cloud vendors’ competitive chips have moved from racks and price lists to whether they dare write checks directly to model companies.

▪ SIGNALAmazon bought equity, but the bill is written into the cloud contract.