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.AI models’ conventional token-by-token output often slowed when responses were lengthy, leading to low utilisation of graphics processing units (GPU) and high user-perceived waiting time, which was a “primary bottleneck in s...