Elon Musk has responded to a report by AI benchmarking platform LMArena, which ranked OpenAI’s GPT-4.5 as the top-performing AI model across all major categories. The latest ranking cements GPT-4.5’s dominance in areas such as coding, mathematics and creative writing. Musk’s response hints at a looming challenge from his AI startup, xAI, as competition in the AI space intensifies.