Chinese state-linked social media accounts amplified narratives celebrating the launch of Chinese startup DeepSeek's AI models last week, days before the news tanked U.S. tech stocks, according to online analysis firm Graphika.

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.

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.