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LangSmith in brief
The LLM observability tool best integrated with LangChain, essential for teams debugging agents in production.
- Price37 €/month
- CategoryMCP et connecteurs
- RecommendedYes
The essentials
- Observability and evaluation platform for LLM applications and agents
- Free plan available, paid from $37/month for teams
- Native integration with LangChain and LangGraph
- Traces, evals, test datasets and production monitoring
What is LangSmith?
LangSmith is LangChain's observability platform. It captures every execution step of an LLM application: prompts sent, responses received, execution time, token cost. On agents, it traces every tool called, every agent decision and the data flowing between nodes. The result is a complete view of what's happening inside your LLM pipeline, impossible to get otherwise.
Strengths
Detailed traces on agents
When an agent does something unexpected, LangSmith shows exactly why: which prompt was sent, which response was received, which decision was made. Debugging that used to take hours takes minutes.
Automated evals
You can define test sets with expected inputs and outputs, and automatically evaluate response quality with LLM or human criteria. Essential to avoid regressions between versions.
Frictionless LangChain integration
One import, a few config lines, and all traces are in LangSmith. If you use LangChain or LangGraph, integration is nearly automatic.
Limits
Less useful outside the LangChain ecosystem
LangSmith integrates with other frameworks but the experience is optimal with LangChain. For a different stack, Langfuse is often preferred.
Pricing for teams
At $37/month per user on the Plus plan, the bill can add up for teams. The free plan covers individual development well.
Pricing
Free Developer plan with 5,000 traces/month. Plus plan at around $37/month for teams. Check smith.langchain.com.
Alternatives
LangSmith = LLM observability integrated with LangChain. Alternative Langfuse (langfuse.com) = $27/month, open source, less tied to LangChain. Alternative Helicone (helicone.ai) = $18/month, lighter, focused on LLM API calls.
Verdict
LangSmith is essential if you use LangChain or LangGraph in production. Visibility into agent executions radically changes your ability to debug and improve performance. For a non-LangChain stack, Langfuse offers more flexibility.
FAQ
Does LangSmith work without LangChain?
Yes, via SDKs or manual integrations. But the experience is better with LangChain and LangGraph.
Is there a free plan?
Yes, with 5,000 traces/month. Sufficient for development, limited for large-scale production.
Can LangSmith evaluate response quality?
Yes, with automatic evals (LLM criteria, ROUGE, etc.) and human annotations. It's one of its most powerful features.
Does LangSmith host my data?
Yes by default. There's a self-hosted option (LangSmith Enterprise) to keep data internal.
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Screenshots LangSmith
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LangSmith : 0/10.
The LLM observability tool best integrated with LangChain, essential for teams debugging agents in production..
Test LangSmith yourself
A free trial is available. Plan thirty minutes to form your own opinion.
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LangSmith
37 €/month