Key Takeaways AI stocks had a volatile week as Wall Street reckoned with the implications of a sophisticated, cost-efficient AI model from Chinese start-up DeepSeek.Semiconductor stocks such as Nvidia and Broadcom sold off on Monday as investors worried DeepSeek's efficiencies would temper enthusiasm for AI infrastructure spending.

A Chinese company’s cut-rate computing solution has upended the tech world, with companies, investors and even the U.S. government trying to understand what it means for the future.

Some AI researchers hailed DeepSeek’s R1 as a breakthrough on the same level as DeepMind’s AlphaZero, a 2017 model that became superhuman at the board games Chess and Go by purely playing against itself and improving, rather than observing any human games.

Here’s what you need to know about DeepSeek, the Chinese AI startup that rattled markets as its app dethroned OpenAI's as the most-downloaded free app in the U.S. on Apple.

Stocks rose Friday as Apple led a broad rally following a strong investor reaction to its quarterly earnings report and the market closes out a whirlwind week highlighted by Nvidia’s record-breaking losses in reaction to China’s DeepSeek cheaper AI model and a flurry of earnings reports.