SpaceX may spend up to $119 billion on ‘Terafab’ chip factory in Texas

The $119 billion figure is a ceiling, not a commitment, and the gap between the $55 billion initial pledge and the full potential spend is doing a lot of work in the headline. More importantly, this is as much a supply security play as a cost play: xAI's dependency on external foundries is a structural vulnerability that Terafab is designed to close.

Big tech's collective $725 billion AI infrastructure commitment (covered May 1 via The Decoder) establishes the arms-race context here, but Terafab is a different kind of bet. Where hyperscalers are buying compute capacity from existing suppliers, xAI is attempting to own the supply itself. That distinction matters especially given the trial disclosure from the same week that xAI has leaned on OpenAI model outputs for its own training, suggesting the organization is racing to close multiple dependency gaps simultaneously. The Pentagon's multi-vendor AI deals (TechCrunch, May 1) also add urgency: defense contracts increasingly reward vendors who can guarantee sovereign, uninterrupted compute, and in-house fabrication capacity would strengthen xAI's pitch there.

Watch whether xAI files for any TSMC or Samsung foundry agreements in parallel over the next six months. If it does, that signals Terafab is a long-horizon hedge rather than a near-term production plan, and the vertical integration story softens considerably.