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LangSmith

LangSmith

Observability and evaluation platform for AI applications

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What this product helps you do

LangSmith combines framework-agnostic tracing with production monitoring, offline and online evaluation, datasets, dashboards, alerts, and human review. Teams can inspect an agent's steps, compare versions against curated datasets, score live traffic, and turn production traces into evidence for the next development cycle.

Problems it solves

  • Agent failures are difficult to reconstruct from final outputs alone
  • Teams need repeatable quality checks before changing prompts or models
  • Production quality, latency, and cost need ongoing monitoring
  • Expert feedback and production traces need to feed future evaluations
Best for
AI application developersAgent engineering teamsML and platform teamsProduct teams operating LLM features

LangSmith is LangChain's observability and evaluation platform for LLM applications and agents. Its tracing tools record model calls, tool activity, timing, cost, and other run data so teams can investigate failures and monitor behavior across supported frameworks and providers.

Evaluation workflows cover curated offline datasets, production scoring, LLM-as-judge and code-based evaluators, annotation queues, and prompt comparison. A free developer plan supports initial use, while paid and enterprise plans expand seats, usage, deployment, hosting, and administration.

Information

DeveloperLangChain Inc.
Languagesen
Pricing modelfreemium
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