ChatGPT is a state-of-the-art language model developed by OpenAI. It is a variant of the GPT (Generative Pre-trained Transformer) model, which is trained on a massive amount of text data to generate human-like text. ChatGPT is specifically designed for conversational AI, with the ability to generate contextually appropriate responses to prompts. It can be fine-tuned for various natural language processing tasks, such as question answering, text summarization, and language translation. The model has been trained on a diverse range of internet text and has the ability to generate text in a variety of styles, registers and formats.