A frenzy over an artificial intelligence chatbot made by Chinese tech startup DeepSeek was upending stock markets Monday and fueling debates over the economic and geopolitical competition between the U.

Key Takeaways U.S. AI stocks sold off Monday as an app from Chinese AI startup DeepSeek dethroned OpenAI's as the most-downloaded free app in the U.S. on Apple.DeepSeek claims its latest model’s performance is on par with that of American AI leaders like OpenAI,

DeepSeek is just one of an array of companies developing AI models and applications. Here’s a guide to a number of the biggest players in China.