DeepSeek a 'wake-up call' for US tech firms, Trump says
Shares in major tech firms such as Nvidia fell sharply, with the chip giant losing almost $600bn (£482bn) in market value. What has shaken the industry is DeepSeek's claim that its R1 model was made at a fraction of the cost of its rivals - raising questions about the future of America's AI dominance and the scale of investments US firms are planning.