LangGraph review

LangGraph ranks first because it gives developers direct control over how an agent moves between steps, which is what long-running production agents need. LangChain describes it as an agent runtime and low-level orchestration framework: you define state and the paths between nodes, then add human-in-the-loop checks that pause the agent for approval, built-in memory that persists across sessions, and token-by-token streaming of reasoning and actions. The same framework covers single agents, multi-agent teams and hierarchical setups. The library is MIT licensed and works with any model provider. The paid side is LangSmith: the Developer plan is free for one seat with 5k base traces a month, and Plus costs $39 per seat a month with 10k traces and one free small serverless deployment. The trade-off is effort. The graph model asks more of you up front than the OpenAI Agents SDK or CrewAI, and metered usage on LangSmith needs watching.

Who it is for

Engineering teams building production agents that must pause for approval, keep memory across sessions and follow controlled multi-agent flows.

Price

Framework free (MIT); LangSmith Developer free for 1 seat; Plus $39 per seat per month plus usage.

$39 / seat per month then pay as you go
Quoted from the vendor pricing page on November 6, 2026.

Key features

• Low-level primitives for single, multi-agent and hierarchical control flows
• Human-in-the-loop checks to steer and approve agent actions
• Built-in memory that keeps context across sessions
• Token-by-token streaming of agent reasoning and actions
• LangSmith tracing, evaluation and managed deployment

Strengths and weaknesses

• Strength: The most control over state and flow of any framework here
• Strength: LangSmith Developer plan is free with 5k base traces a month
• Strength: Plus includes one free Serverless (Small) deployment
• Weakness: Graph-based design takes longer to learn than higher-level SDKs
• Weakness: LangSmith usage beyond included traces is metered in LangChain Standard Units
• Weakness: Self-hosted and hybrid LangSmith need the Enterprise plan

Key facts

• License: MIT
• LangSmith Developer: $0, 1 seat, 5k base traces a month
• LangSmith Plus: $39 per seat per month, 10k base traces a month
• Startup credits: Up to $10,000 for VC-backed startups

Where it ranks

LangGraph is No. 1 in our Best AI Agent Frameworks verdict.