Nvidia and other U.S. tech stocks are steadying a day after tumbling on doubts about whether the artificial-intelligence frenzy really needs all the dollars being poured into it. The S&P 500 was 0.2% higher in early trading Tuesday.

Chinese startup DeepSeek published a research paper in which it claimed to have trained a large language model rivaling the performance of leading U.S. models, while spending much less money than U.S.