OpenAI is in talks to raise a funding round that would value the artificial intelligence startup at more than $100 billion. Thrive Capital is leading the round and will invest $1 billion. Microsoft, which is OpenAI’s biggest backer, is also participating in the round. The news follows OpenAI’s announcement last week that it would debut a prototype of its search engine, called SearchGPT, which aims to give users “fast and timely answers with clear and relevant sources.”