The successor to Chat GPT. Generative Pre-trained Transformer 4 is a multimodal large language model created by OpenAI and the fourth in its GPT series. It was released on March 14, 2023, and has been made publicly available in a limited form via ChatGPT Plus, with access to its commercial API being provided via a waitlist. It supposedly powers Bing AI (though there is no public confirmation about this and Microsoft calls the model Prometheus)
GPT 4 supports 28K tokens, instead of ChatGPT's 8k tokens. It blows the competition out of the water.