In “The Optimist: Sam Altman, OpenAI, and the Race to Invent the Future,” Wall Street Journal reporter Keach Hagey examines our AI-obsessed moment through one of its key figures — Sam Altman ...

Despite its size, OpenAI notes in a white paper that it does not consider GPT-4.5 to be a frontier model. Subscribers to ChatGPT Pro, OpenAI’s $200-a-month plan, will gain access to GPT-4.5 in ...