This week, OpenAI redefined what momentum — and risk — look like in the artificial intelligence arms race.

Now comes the hard part: Executing on CEO Sam Altman 's multitrillion-dollar vision.

In a rapid-fire series of announcements, the company unveiled partnerships involving mind-bending sums of money and cemented its place at the center of the next wave of machine learning infrastructure.

It began Monday with news that Nvidia plans to invest up to $100 billion to help OpenAI build data center capacity with millions of graphics processing units, or GPUs. A day later, OpenAI revealed an expanded deal with Oracle and SoftBank , scaling its "Stargate" project to a $400 billion commitment across multiple phases and sites. Then on Thursday, OpenAI deepene

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