"OpenAI generated $13.07 billion in revenue in 2025" Considering just four years ago they were a research lab with hardly any revenue at all, and no corporate muscles for earning revenue, I think that is a very impressive number. (Sure, they're losing a whole lot of money too. Same goes for almost every other hyper-growth company in the history of tech.)
Growth means some inefficiencies, but their expenses are largely around commodities like electricity and data centers not a sudden army of salespeople. They also got 150M 11 years ago and 1 billion 7 year ago, they where quite large in 2022.
Basically you don’t get better at writing checks to your local utility which limits how much they can control costs.