Generative Pre-trained Transformer 4 (
GPT-4) is a multimodal large language model created by OpenAI, and the fourth in its numbered "GPT-n" series of GPT foundation models. It was released on March 14, 2023, and has been made publicly available in a limited form via the chatbot product ChatGPT Plus, and with access to the GPT-4 based version of OpenAI's API being provided via a waitlist. As a transformer based model, GPT-4 was pretrained to predict the next token, and was then fine-tuned with reinforcement learning from human and AI feedback for human alignment and policy compliance.