Chinese artificial intelligence start-up DeepSeek’s latest flagship model has been ranked as one of the world’s best on an intelligence-per-dollar basis, far exceeding those from US heavyweights OpenAI and Anthropic in cost-efficiency after a 75 per cent promotional price cut was made permanent.The Hangzhou-based start-up announced the permanent price cut for its V4 Pro model on Saturday, a month after it released the long-awaited V4 generation, which comprises the flagship V4 Pro model and its...