Consumer demand for the latest AI technology is heating up. The launch of OpenAI’s latest flagship model, GPT-4o, has now driven the company’s biggest-ever spike in revenue on mobile, despite the model being freely available on the web. GPT-4o, which launched May 13, can handle text, speech and video, and delivers real-time responsiveness and a range of emotive voice options, making it a far more powerful model than what was offered before. This technical innovation is also pushing more users to...