KEY TAKEAWAYS A slew of stocks, including chip maker Nvidia, tumbled Monday after Chinese startup DeepSeek released an AI model that runs on less-advanced chips and at a lower cost than those of U.S.

That’s the big question on the minds of investors Monday, given the newfound attention on DeepSeek, a Chinese AI app that has climbed to the top of downloads from Apple’s U.S. App Store. The service has become so popular that it’s restricting registration due to what it called “large-scale malicious attacks.