Overview
LangSmith — Build reliable LLM applications with observability
LangSmith is a developer platform for LLM application debugging, testing, evaluation, and monitoring. Built by LangChain, it traces every LLM call and chain execution, visualizes complex agent behaviors, enables A/B testing of prompts, and monitors production application quality.
LLM trace visualization
Prompt testing
Evaluation datasets
Production monitoring
Features & capabilities
Everything it does, in plain English.
FeatureLLM trace visualizationIncluded
FeaturePrompt testingIncluded
FeatureEvaluation datasetsIncluded
FeatureProduction monitoringIncluded
FeatureCollaborationIncluded
API AccessProgrammatic access available for developers.Available
PlatformsWeb · Python
The honest take
Where it shines, where it stumbles.
✓ Pros
- ✓Best LangChain integration
- ✓Visual trace debugging
- ✓Good evaluation tools
! Watch-outs
- !Tied to LangChain ecosystem
- !Can be expensive at scale
Who it's for
Where LangSmith pays for itself fast.
— Use case
LLM debugging
— Use case
Prompt optimization
— Use case
Agent monitoring
— Use case
AI quality assurance
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