Chinese AI models at the centre of growing divide in Silicon Valley

DeepSeek, Qwen, GLM and Kimi are among Chinese AI models at the centre of a growing divide in Silicon Valley. The Trump administration is weighing restrictions on US access, dividing the tech industry. Supporters say the models drive innovation and help American startups compete. Critics allege some Chinese AI companies built them using technology copied from US firms. Ira Spitzer reports from San Francisco.