ChatGPT Extension is used for natural language processing, text generation, and other language-related tasks. It is commonly used to create intelligent chatbots and virtual assistants that can interact with users in natural language. Additionally, ChatGPT can be used for a range of other applications, such as language translation, summarization, and sentiment analysis. With its advanced language capabilities and flexible range of models and endpoints, ChatGPT Extension is a powerful tool for developers looking to build sophisticated and engaging conversational interfaces.