Cube's integration with LangChain enhances the development of AI applications by utilizing a semantic layer that ensures data accuracy and predictability in text-to-SQL LLM-based applications. This integration facilitates the use of Cube's semantic layer as a crucial component in AI experiences, addressing issues like AI hallucinations by centralizing metric calculations. A key feature is the new document loader, which populates a vector database with embeddings from Cube's data model, enabling natural language queries to be matched with data model views. The integration also includes a chat-based demo application, which uses OpenAI's LLM and Streamlit for a user-friendly interface, demonstrating how tables, columns, and filters in SQL queries can accurately reflect human input. This approach abstracts SQL complexities, providing a seamless, error-prone way to access data, and exemplifies the potential for enterprises to harness internal knowledge using LLM reasoning.