Companies and government agencies around the world are moving to restrict their employees’ access to the tools recently released by the Chinese artificial-intelligence startup DeepSeek, according to the cybersecurity firms hired to help protect their systems.

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.

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.