lxi.ai is a custom question-answering tool that uses OpenAI's GPT model to provide trustworthy answers from a user's own documents. Users can upload PDFs, docx files, and text files, or import webpage content directly to create a library of documents. The tool uses machine learning to process the documents and store relevant information in a way that makes it easy to find and extract answers to specific questions. Once the library is created, users can ask questions and receive concise, factual answers based on the information in their documents. Lxi.ai charges users based on the size of the documents and the number of questions asked after the 14-day free trial period. The tool currently supports only English, but additional language support is in the product's roadmap. The system can handle thousands of documents, but the quality of answers is dependent on the quality of information in the documents. Lxi.ai offers a 14-day free trial with set usage limits, and users can control their question costs by using their OpenAI API Key. Enterprise users can get in touch with dedicated customer support for their specific needs. Overall, lxi.ai offers an efficient and customizable way to extract answers to specific questions from a user's own documents using AI technology.