OpenAI is adding a new set of search features to its flagship product ChatGPT, escalating the artificial intelligence startup’s challenge to Alphabet Inc.’s Google.The option, called ChatGPT Search, will let the chatbot’s users search for timely information much as they would on the web and get responses with in-line attribution to news publishers and other data sources, OpenAI said Thursday. The company rolled out a prototype of the product in July called SearchGPT, which was separate from its...