LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

LangChain is a framework for building agents and LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development — all …

Apr 14, 2026 · LangChain is an open-source framework that simplifies building applications using large language models. It helps developers connect LLMs with external data, tools and workflows and is …

LangChain is a software framework that helps facilitate the integration of large language models (LLMs) into applications. As a language model integration framework, LangChain's use-cases largely overlap …

LangChain is the platform for agent engineering. AI teams at Clay, Rippling, Cloudflare, Workday, and more trust LangChain’s products to engineer reliable agents.

LangChain is an open source framework with a pre-built agent architecture and integrations for any model or tool, so you can build agents that adapt as fast as the ecosystem evolves.

LangChain is an open source framework with a prebuilt agent architecture and integrations for any model or tool—so you can build agents that adapt as fast as the ecosystem evolves

Agent harness built with LangChain and LangGraph. Equipped with a planning tool, a filesystem backend, and the ability to spawn subagents - well-equipped to handle complex agentic tasks.

Choose LangChain when you want a quick way to get started and to standardize how teams build agent patterns. Learn more about when to choose each LangChain framework.

Unified API reference documentation for LangChain, LangGraph, Deep Agents, LangSmith, and Integrations. Browse Python and TypeScript packages, explore classes, functions, and types across …