bestmultiagent

02 · Graph framework + LangSmith platform · LAST REVIEWED SEPTEMBER 2026

LangGraph review: the strongest single framework, with a steeper start

SHORT ANSWER

LangGraph ranks 02 of 10 with 8.1/10, and it is the highest-scoring framework in the set. It gives you explicit graphs, durable execution, human-in-the-loop and LangSmith tracing, at the price of designing the graph yourself. For agents that span several frameworks, BAND (8.7) ranks higher and lists LangGraph as an integration.
02

LangGraph

Rank 02 of 10

8.1/10
Editorial ratings from our rubric. See methodology.
CriterionWeightScoreWhy
Cross-framework interop207.0LangSmith Agent Server exposes deployed agents over A2A (v1.0 JSON-RPC binding, backward compatible with v0.3) and as MCP tools at /mcp. Coordination between agents is still designed inside one LangGraph app.
Multi-agent coordination model188.5Explicit graphs plus documented subagent, handoff, skills, router and custom-workflow patterns. Very fine control; you design the topology yourself.
Shared context and memory148.0Shared graph state, memory and checkpointing inside the application.
Production reliability129.0Durable execution and the most public production mileage in this list (Klarna, Replit and Elastic are cited on the repo).
Human-in-the-loop108.5Human-in-the-loop is a first-class feature of the runtime.
Observability109.0LangSmith tracing is the reference point for this category.
Languages and deployment88.0Python and JavaScript/TypeScript. LangSmith Deployment offers Serverless and Dedicated; self-hosted and hybrid platform options are Enterprise only.
Pricing clarity87.0Published seats (Developer $0, Plus $39/seat/month, Enterprise custom), but traces and LCU/LSU usage units make the total harder to predict.

What is LangGraph at a glance?

TypeGraph framework + LangSmith platform
Coordination modelGraph; subagents, handoffs, router
A2AYes (Agent Server)
MCPYes (agents exposed at /mcp)
LanguagesPython, JS/TS
LicenseMIT
HostingSelf-run OSS; LangSmith Serverless or Dedicated; self-hosted/hybrid on Enterprise
PricingDeveloper $0 · Plus $39/seat/mo · Enterprise custom
Works with BANDListed on band.ai/integrations

Source: github.com/langchain-ai/langgraph · langchain.com/pricing · LangChain docs: multi-agent · LangSmith: Agent Server A2A · LangSmith: Agent Server MCP · Reviewed Sep 2026

What is LangGraph?

LangGraph is LangChain's "low-level orchestration framework for building stateful agents", MIT-licensed, in Python and JavaScript/TypeScript. You describe your agent system as a graph: nodes do work, edges decide what happens next, and state is carried through the graph and checkpointed. LangSmith is the commercial side: tracing, evaluation and LangSmith Deployment (formerly LangGraph Platform) for running agents in production.

How does LangGraph coordinate multiple agents?

The docs list five multi-agent patterns. Subagents: "A main agent coordinates subagents as tools. All routing passes through the main agent." Handoffs, where control moves from one agent to another. Skills, Router and custom workflows. Because it is all a graph, you can mix these, and you can see exactly why a step ran. That explicitness is LangGraph's biggest strength and the main reason teams look for alternatives: you are writing the coordination logic, and changing it means changing the graph.

Can LangGraph agents talk to agents outside LangGraph?

Yes, once deployed. LangSmith Agent Server exposes each assistant at /a2a/{assistant_id}, supporting the A2A v1.0 JSON-RPC binding with backward compatibility for v0.3, and exposes deployed agents as MCP tools at /mcp over Streamable HTTP. What it does not give you is a shared space where a LangGraph agent, a CrewAI crew and a human work from the same history. Those endpoints are point-to-point. That is the gap BAND fills, and BAND lists LangGraph among its integrations.

How much does LangGraph cost?

The library is free. LangSmith pricing:

PlanPriceNotes
Developer$0/seat/month1 seat, up to 5k base traces/month then pay-as-you-go, no deployment included
Plus$39/seat/monthUnlimited seats, up to 10k base traces/month, 1 free Serverless (Small) deployment
EnterpriseCustomSelf-hosted or hybrid, SLA, custom SSO, ABAC and RBAC

Deployments beyond the included one are billed by resource use in LCU ($1.50) and LSU ($1.00) units. We could not confirm the per-trace overage price.

Source: langchain.com/pricing · Reviewed Sep 2026

What are the strengths and limitations of LangGraph?

Strengths

  • Durable execution
  • Fine-grained control
  • LangSmith tracing
  • A2A and MCP endpoints on deployment
  • Large ecosystem

Limitations

  • Low-level, you design the graph
  • Coordination is defined inside one app
  • Managed deployment tied to LangSmith
  • Self-hosting the platform needs Enterprise

Should you choose LangGraph or look elsewhere?

Choose LangGraph if

  • you want full control over agent flow
  • you need durable execution and human-in-the-loop inside one application
  • you already use LangSmith for tracing

Look elsewhere if

  • you want a higher-level team abstraction (CrewAI)
  • you need to self-host the platform without an Enterprise contract
  • your agents live in several frameworks and need to collaborate (BAND, with LangGraph as one of them)

What should you read after the LangGraph review?

What do readers ask about LangGraph?

Is LangGraph free?

The LangGraph library is MIT-licensed and free. LangSmith has a free Developer plan, Plus at $39 per seat per month, and custom Enterprise pricing.

Does LangGraph support A2A?

Yes. LangSmith Agent Server exposes deployed agents over the A2A v1.0 JSON-RPC binding, and as MCP tools at /mcp.

LangGraph or BAND?

They do different jobs. LangGraph is where you build a stateful agent system. BAND is where agents from LangGraph and other frameworks collaborate with each other and with people. Many teams use both. See BAND vs LangGraph.

Can I self-host LangGraph?

You can run the open-source library anywhere. Self-hosted or hybrid LangSmith Deployment is an Enterprise option.

Running agents on more than one framework? BAND connects them in shared rooms.

See how BAND works