OpenAI is rolling out a more powerful and long-awaited new artificial intelligence model called GPT-5, vying to stay ahead of increased competition from rivals in the US and China. GPT-5, set to be unveiled during a livestreamed event on Thursday, is designed to be more capable at coding and creative writing as well as reasoning through complex queries. In a briefing with reporters this week, OpenAI Chief Executive Officer Sam Altman called it a “major upgrade” from the company’s prior AI models...