A surprise development may have turned the market for artificial intelligence (AI) chips on its head. DeepSeek, a China-based start-up, developed an open-source large language model, claiming it took two months and cost less than $6 million.

Shares of Nvidia fell about 1% Thursday and briefly dipped below a key technical measure. That could mean more downside ahead. Nvidia stock has now tumbled nearly 11% so far this

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