Loading tool details...
LangChain
8.9/10
"LangGraph agents + LangSmith observability—the production-grade LLM application stack."
The standard LLM framework with LangGraph (stateful agents), LangSmith ($39/user/mo observability), and hosted agent platform.
Best for:AI EngineersDevelopersEnterpriseAgent Builders
Free (open-source) / LangSmith Plus $39/user/mo / LangGraph hosted
Verified Tool
About LangChain
LangChain is the most widely-adopted framework for building LLM-powered applications. Open-source (MIT), available in Python and JavaScript/TypeScript. Used by Uber, LinkedIn, Klarna, JP Morgan.
LangGraph: agent orchestration framework for stateful, multi-actor applications. State machines, branching logic, human-in-the-loop, persistent state. Open-source library + hosted platform. Hosted free: 100K node executions/mo. Plus: $0.001/node + standby ($0.0007-0.0036/min)—requires LangSmith Plus. Enterprise: custom/self-hosted.
LangSmith: observability, testing, and evaluation platform. Developer (free): 1 user, 5,000 base traces/mo, 14-day retention. Plus ($39/user/mo): up to 10 seats, 10,000 traces/user/mo, extended traces (400-day, $5/1K). Enterprise: custom, unlimited users, self-hosted/hybrid options.
Core framework: chains (sequential LLM calls), agents (autonomous), memory (conversation history). Standardized content blocks, simplified package structure, production middleware. Integrates with all major LLMs (OpenAI, Anthropic, Google, Mistral), vector databases, and tools.
Additional traces beyond limits: $0.50/1,000 base traces. Extended trace upgrade: $4.50/1,000.
Key Features
LangGraph (Stateful Agents)
LangSmith (Observability)
Chain Composition
Multi-LLM Integration
LangGraph Hosted Platform
Extended Trace (400-Day)
Production Middleware
The Good
- Industry standard with the largest community
- LangGraph hosted platform for production agents
- LangSmith provides essential observability
- Open-source core is completely free
The Not-So-Good
- Complexity steep learning curve for newcomers
- LangGraph Plus requires LangSmith Plus ($39/user/mo)
- Abstraction overhead for simple tasks
- Documentation quality varies across ecosystem
Editor's Review
Editor's Review (February 2026)
LangChain remains the industry standard. LangGraph adds stateful agent orchestration with a hosted platform (100K free node executions/mo). LangSmith provides production observability at $39/user/mo with 400-day extended traces. The ecosystem is mature and battle-tested.
What We Love:
• LangGraph: stateful multi-actor agents with hosted platform
• LangSmith: production observability with 400-day extended traces
• Largest community and ecosystem of any LLM framework
• Free tier: open-source core, 5K traces/mo, 100K node executions
What Could Be Better:
• LangGraph Plus requires LangSmith Plus ($39/user/mo)—costs add up
• Complexity has grown significantly with steep learning curve
• Abstraction overhead makes simple tasks unnecessarily complex
• Documentation quality varies across the vast ecosystem
Who Should Use It:
AI engineers building production LLM applications. If you need the broadest ecosystem, most community support, and production-grade observability, LangChain + LangSmith + LangGraph is the complete stack.
Frequently Asked Questions
Q:What is LangGraph?
Agent orchestration framework for stateful, multi-actor applications. State machines, branching logic, human-in-the-loop, persistent state. Hosted platform: free (100K nodes/mo), Plus ($0.001/node, requires LangSmith Plus).
Q:How much does LangSmith cost?
Developer (free): 1 user, 5,000 traces/mo, 14-day retention. Plus: $39/user/mo, up to 10 seats, 10,000 traces/user/mo. Enterprise: custom, unlimited, self-hosted. Overage: $0.50/1,000 traces.
Q:Is LangChain free?
The framework is open-source (MIT) and free. Costs come from LangSmith ($39/user/mo for Plus), LangGraph hosted platform, and external services (LLM APIs, vector databases, hosting).
Q:LangChain vs LlamaIndex vs Haystack?
LangChain: broadest framework for agents, chains, and memory. LlamaIndex: data indexing and retrieval. Haystack: production search with hybrid retrieval. Choose based on your primary use case.
Tool Information
Pricing ModelFreemium
Starting PriceFree (open-source) / LangSmith Plus $39/user/mo / LangGraph hosted
CategoryAI Agents
Last UpdatedFeb 2026
