The Nasdaq & S&P 500 fell after Chinese startup DeepSeek shows AI can be built cheaply, sparking fears AI spending will stall. The blue-chip Dow rose.

American AI stocks got sucker punched after China's DeepSeek app reportedly showed advancements against rivals sending investors into sell mode, shaving 3% off the Nasdaq.

But no consensus on whether impact of Chinese AI start-up will hasten tech decoupling of the two economies or sow greater partnership The earthquake that struck US tech stocks this week over the advance of Chinese artificial intelligence start-up DeepSeek is sending shock waves beyond Wall Street and Silicon Valley,