The writings followed a simple format, apparently taken from a social media meme: Finish the following. Be me. I am (insert name of person or object). • The one I saw on X described the life of a worker of a certain level at Meta. • I had to try it out myself. I asked GPT-4.5 to be a journalist at Axios, a parent of a sixth grader, a sixth grade teacher, an only kid with aging parents and a transgender person trying to endure this moment in time. •...

While the improvements feel as incremental as its name suggests, GPT-4.5 is still OpenAI’s most ambitious drop to date. Released in late February as a research preview—which essentially means OpenAI sees this as a beta version—GPT-4.5 uses more computing power than its previous models and was trained on more data. So, just how big is the GPT-4.5 research preview? Who knows—since the developers won’t say. And where did this additional training data come from? Their lips are zipped on that as well. To borrow a line from Apple TV’s hit...