Rebounding tech stocks drove U.S. indexes higher Tuesday, a day after they tumbled on doubts about whether the artificial-intelligence frenzy really needs all the dollars being poured into it. The S&P 500 climbed 0.

In a matter of days, DeepSeek proved to be so popular as to climb to the top of Apple's App Store, surpassing OpenAI's ChatGPT as the most downloaded app. But for owners of Nvidia stock, and stock traders in general, DeepSeek is on track of becoming a black swan — an unexpected event with extreme consequences.

Rebounding tech stocks drove U.S. indexes higher a day after they tumbled on doubts about the artificial intelligence frenzy.

Technology stocks regained ground on Tuesday, a day after a low-cost Chinese AI model rattled markets, while traders rotated back into the dollar from safe-haven currencies. The tech rebound boosted Wall Street's main stock indices,

The success of a mysterious Chinese lab has investors questioning the AI spending boom that has swept Silicon Valley.

Tech stocks nudged lower on Tuesday with chipmaker Nvidia falling 2% in early trade, a day after it suffered the biggest one-day market capitalisation loss in history, though traders did shift back out of safe-haven currencies into the dollar.