A chatbot made by Chinese Artificial Intelligence Startup Deepsek has reached the top of Apple's App Store Chart in the US this week, separating Openai's Chatgpt as the most downloaded free app. The AI Assistant is powered by the open-source model of Dipsek, which is The company says The world's leading models can be trained at a fraction of cost using much less chips. The claim has provoked financial markets, in which NVidia's stock costs more than 12 percent in pre-market trading.