Build AI with Claude Sonnet 4.6 & LangChain

What We’re Building

In this tutorial, we will construct a conversational AI application using the Claude Sonnet 4.6 model from Anthropic, integrated with LangChain to handle complex dialogues and maintain conversational context. The application will be capable of understanding user input, managing context over long interactions, and providing intelligent responses. Notably, Claude Sonnet 4.6 features a 1M token context window, enhancing its ability to manage extensive conversations.

The finished project will allow users to interact with the AI in a conversational manner, enabling capabilities such as answering questions, providing recommendations, and even executing specific tasks based on user queries. This project demonstrates the power of combining state-of-the-art language models with robust conversational frameworks.

Setup and Installation

To get started, we’ll set up our development environment by installing necessary libraries and configuring our environment variables. This setup ensures that we have all tools required to build and run our application.

pip install langchain anthropic

Next, configure your environment variables to securely store your Claude Sonnet 4.6 API key. This key is essential for authenticating your requests to...