A research preview of our strongest GPT model. Available to Pro users and developers worldwide.We’re releasing a research preview of GPT‑4.5—our largest and best model for chat yet. GPT‑4.5 is a step forward in scaling up pre-training and post-training. By scaling unsupervised learning, GPT‑4.5 improves its ability to recognize patterns, draw connections, and generate creative insights without reasoning.Early testing shows that interacting with GPT‑4.5 feels more natural. Its broader knowledge b...