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LangChain

Build agentic LLM apps with a modular Python framework

LangChain is an open-source framework for building agents and LLM-powered applications. It helps developers connect models, tools, and external systems into multi-step workflows.

Open Source
API
Chrome Extension
Integrations
B2B
For Developers
For Teams
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About

What It Is

LangChain is an open-source Python framework for building agents and LLM-powered applications. It is aimed primarily at developers and teams that want to assemble model calls, tools, retrieval, and integrations into custom workflows rather than use a finished end-user app.

What to Know

LangChain is strongest when you need flexibility and a large integration surface. It is useful for prototyping and production development, but it is not a turnkey autonomous agent product; you still need to design the workflow, choose models, and...

Key Features
Python framework for building agents and LLM applications
Interoperable interfaces for models, embeddings, vector stores, and retrievers
Third-party integrations for data sources, tools, and model providers
Modular component-based architecture for composing workflows
Works with LangGraph for more controllable agent orchestration
Use Cases
Building custom AI agents that call tools and external systems
Prototyping LLM applications before hardening them for production
Connecting language models to retrieval and data-augmentation workflows
Agenticness: Guided Assistant

Executes tasks you assign, one step at a time, within narrow domains.

High evidence
Last evaluated: Mar 30, 2026

Dimension Breakdown

Action Capability
Autonomy
Adaptation
State & Memory
Safety
How agenticness works →

Categories

Agent Frameworks & Orchestration
Pricing
  • Free: Open-source library under the MIT license
  • Pro: Not publicly available for the core library
  • Enterprise: Not publicly available from the README content
Details
langchain.com
AddedJanuary 16, 2026
RefreshedMarch 30, 2026
Agenticness
Guided Assistant
Quick Facts
DeploymentSelf-hosted
AutonomyCopilot (human-in-loop)
Model supportMulti-model
Open sourceYes
MCP supportYes
Team supportSmall team
Pricing modelFree / open source
Interfaceapi, cli
Sources
WebGitHub - langchain-ai/langchain: The agent engineering platform · GitHub
GHlangchain-ai/langchain
GHREADME.md
WLangChain
WebDocumentation
Weblangchain on PyPI
Last updated March 30, 2026
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