Chinese artificial intelligence start-up DeepSeek has rolled out a major upgrade to its flagship V4 model aimed at sharply accelerating AI response generation, as competition among Chinese developers increasingly shifts to reducing serving costs and enhancing user experience. DeepSeek, by adopting what it called a speculative decoding framework, DSpark, said it increased per-user response speeds by up to 85 per cent, an efficiency gain that could reduce AI systems’ reliance on larger, more...