It began with news that Nvidia plans to invest up to $100 billion to help OpenAI build data center capacity. A day later, OpenAI revealed an expanded deal with Oracle and SoftBank, scaling its “Stargate” project to a $400 billion commitment. At roughly $50 billion per site, OpenAI’s projects add up to about $850 billion in spending. OpenAI CEO Sam Altman acknowledged concerns about the market getting overheated but rejected the idea that the spending spree is overkill. Despite the massive investments and breakneck growth, Altman has “mixed feelings” about taking the company public.