HONG KONG, Apr 24:DeepSeek, the Chinese artificial intelligence startup that shook world markets last year, launched preview versions of its latest major update Friday as the AI rivalry between China and the US heats up.DeepSeek’s V4 has been keenly anticipated by users keen to test how it compares to US competitors like OpenAI’s ChatGPT, Anthropic’s Claude and Google’s Gemini. Anthropic and OpenAI have accused DeepSeek of unfairly building its technology off their own.Some industry analysts had expected the new model to arrive more than a month earlier at the start of the Lunar New Year.DeepSeek says the new V4 open-source...