Four Chinese generative artificial intelligence start-ups have been valued at between $1.2bn and $2.5bn in the past three months, leading a pack of more than 260 companies vying to emulate the success of US rivals such as OpenAI and Anthropic.  The newly minted unicorns — Zhipu AI, Moonshot AI, MiniMax and 01.ai — have gained significant backing from a largely domestic pool of investors and are fighting to hire the best talent to develop the most popular AI products. “There is no winner of found...