The main difference between GPT Chat and Google Write 2000word is that GPT Chat is a chatbot that uses large amounts of data to generate human-like conversations, while Google Write 2000word is a writing tool that enables users to create content with a word limit of 2000 words. GPT Chat uses natural language processing (NLP) and machine learning (ML) to generate conversations that are more like human conversations, while Google Write 2000word uses a more traditional approach to content creation. GPT Chat also uses text-to-speech technology to generate more natural-sounding conversations. Google Write 2000word, on the other hand, does not use any of these technologies, and it focuses more on providing users with a more traditional writing experience.