LangSmith

LangChain's framework-agnostic observability and evaluation platform for LLM applications and agents, providing run tracing, dashboards, prompt management and automated evals. Offers managed cloud, bring-your-own-cloud and self-hosted options.

Website

https://www.langchain.com/langsmith

Who it's for

Teams debugging agents in production who want tracing plus evaluation and monitoring in one place.

Pricing

Usage-based: Developer $0/seat/mo (about 5,000 base traces, 1 seat); Plus $39/seat/mo (about 10,000 base traces, 14-day retention); Enterprise custom.

Category

Agent operations

Last verified

2026-10-22 (current)

Confidence

medium

Key facts

• Closed-source hosted platform owned by LangChain
• Captures every model call and tool use as a trace tree
• Framework-agnostic: OpenAI and Anthropic SDKs, Vercel AI SDK, LlamaIndex, plus OpenTelemetry ingestion
• SDKs for Python, TypeScript, Go and Java
• Self-hosted and bring-your-own-cloud deployment available

Sources

Every claim above is drawn from these; we do not publish unsourced specifications.

• https://www.langchain.com/langsmith
• https://www.datacamp.com/blog/langfuse-vs-langsmith

Notes & uncertainties

Trace overage rates verified only to plan level; confirm exact per-trace billing before committing.

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