LangChain

LangChain

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LangChain provides a comprehensive suite of products to support developers throughout their entire development workflow.

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LangChain
Last Updated Nov 10, 2026
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About

LangChain is a powerful framework built specifically for developers, designed to simplify and accelerate the development of applications powered by large language models (LLMs). It offers a comprehensive suite of tools and components that make it easy to build, deploy, and maintain AI-based applications, marking a new era in AI application development.

Key Features

Modular architecture: Provides modular components such as models, prompts, chains, agents, and memory for flexible and convenient combinations.
Multi-model support: Compatible with a wide range of leading language models, including OpenAI, Anthropic, Hugging Face, and more.
Data connectivity: Supports integration with various data sources such as documents, databases, and APIs, enabling dynamic data interactions.
Agent system: Allows models to autonomously execute tasks such as tool calling and decision-making, enhancing the intelligence level of applications.

Pricing & Fees

  • Pricing: LangSmith offers a free Developer plan ($0/seat/month, 1 seat), a Plus plan at $39/seat/month with up to 10k base traces/month included, and an Enterprise plan with custom pricing and pay-as-you-go usage.
  • Usage-based billing: Beyond included trace volumes, usage is metered in LangChain Standard Units (LSU) at $1.00 per LSU, covering compute, memory, and other consumption.
  • Free tier: The Developer plan includes up to 5k base traces/month and community support at no cost, with pay-as-you-go charges thereafter.
  • Enterprise options: Enterprise adds self-hosted and hybrid deployment, custom SSO/ABAC/RBAC, a support SLA, and custom seat and workspace counts.
  • Open-source frameworks: The LangChain, LangGraph, and deepagents agent frameworks remain open source and free to use independently of the paid LangSmith platform.

Who It's For

LangChain is ideal for AI researchers, software engineers, product managers, and any developer looking to integrate language models into their projects. Whether you're at a startup or a large enterprise, LangChain helps boost development efficiency and enables the creation of innovative applications.

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