Elon Musk's lawsuit against OpenAI hit its final day of discovery Wednesday, and a Microsoft executive dropped a stunning number on the stand: by June 2026, Microsoft's total investment in OpenAI — including equity, infrastructure, and compute hosting costs — will surpass $100 billion.
That figure dwarfs the widely known $13 billion cash investment, revealing for the first time the true cost Microsoft has paid to lock in OpenAI at the hardware and infrastructure level. Microsoft CTO Kevin Scott, also in court that day, confirmed that when the two companies built their first supercomputer years ago, they deployed tens of thousands of GPUs in a single go.
Beyond the eye-popping bill, the trial's wrap-up had its own drama. After Microsoft and OpenAI announced they had finished presenting evidence, Musk's team — which could have rebutted — surprisingly opted for no rebuttal case. That means three weeks of discovery are officially over, and the court will move directly to closing arguments on Thursday.