LangGraph
An open-source framework from LangChain for building controllable, stateful AI agents.
What is LangGraph?
LangGraph is an open-source framework from LangChain for building AI agents as graphs of steps. It gives developers control over how an agent moves between steps, keeps state over time, supports human-in-the-loop approvals and handles multi-agent setups.
Simple agent loops can be unpredictable. LangGraph lets developers define the structure explicitly: nodes for steps, edges for transitions, and shared state that persists across steps and sessions.
This makes it easier to build reliable agents with features like pausing for human approval, resuming after interruptions, branching logic and coordination between several specialized agents.
LangGraph is available in Python and JavaScript and integrates with LangChain's ecosystem, including tools for tracing, evaluation and deployment.
Key features of LangGraph
- Graph-based agents: Define steps and transitions explicitly.
- Persistent state: Memory across steps and sessions.
- Human in the loop: Pause for approvals and edits.
- Multi-agent: Coordinate several agents.
- Streaming: Stream intermediate steps to users.
What you can use LangGraph for
- Production AI agents
- Customer support agents with approvals
- Research and analysis workflows
- Multi-agent systems
Pros and considerations
Strengths
- Fine-grained control
- Open source
- Strong ecosystem
Things to check
- Requires programming skills
- Learning curve for graph concepts
- Deployment and monitoring need extra tooling
LangGraph pricing
Open source. LangGraph is open source; LangChain also offers paid platform services for deploying and monitoring agents. Check the official site for current options.
Who LangGraph is best for
Developers building reliable, controllable AI agents for production.
Independent listing by AI Agent Help, last reviewed October 2026. Features and pricing change; check the official website for the latest details. Spot something out of date? Tell us.
Frequently asked questions
Is LangGraph free?
Yes, the framework is open source.
Do I need LangChain to use LangGraph?
It works well with LangChain but can be used with your own components.