DeepSeek, a Chinese artificial-intelligence startup that’s just over a year old, has stirred awe and consternation in Silicon Valley after demonstrating AI models that offer comparable performance to the world’s best chatbots at seemingly a fraction of their development cost.

The sudden rise of Chinese AI app DeepSeek has leaders in Washington and Silicon Valley grappling with how to keep the U.S. ahead in the crucial technology.

DeepSeek, a Chinese AI-chatbot app which launched last week, has sparked chaos in the US markets and raised questions about the future of America's AI dominance. The BBC takes a look at how the app works. DeepSeek looks and feels like any other chatbot, though it leans towards being overly chatty.