GPT-4 is bigger and better than ChatGPT—but OpenAI won’t say why

OpenAI has finally unveiled GPT-4, its next-generation large language model. Its last surprise hit, ChatGPT, was always going to be a hard act to follow, but the San Francisco–based company has made GPT-4 even bigger and better. Yet how much bigger and why it’s better, OpenAI won’t say. GPT-4 is the most secretive release the…