Hands-On With GPT-4.5, OpenAI's Most Powerful Model Yet

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? And where did this additional training data come from? Their lips are zipped on that as well.