LangSmith
An observability and evaluation platform for tracing agent execution, inspecting failures and testing AI application outputs.
About LangSmith
Teams need to connect production-agent failures to the model calls, tool steps and evaluation cases that explain them.
Who it’s for
- Engineers debugging deployed AI agents
- Teams comparing application changes with datasets and evaluations
When to consider it
Consider LangSmith when you want framework-independent tracing and evaluation workflows for an AI application.
Tradeoffs & limitations
- The Developer plan is $0 per seat per month for one seat with 5,000 base traces per month, then pay-as-you-go. Plus is $39 per seat per month plus usage; self-hosted and hybrid options have custom Enterprise pricing.
SOTA overview · Documentation-based assessment · Sources & review method
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Sources & review method
Documentation-based assessment · Oct 30, 2026 · Prepared with AI assistance; not a hands-on benchmark.
- LangSmith observability, framework integrations and evaluation workflow
- Developer allowances, Plus pricing and Enterprise hosting options
- LangSmith Cloud changelog
- Official notice moving the SDKs to separate repositories
- Current maintained Python SDK
Checked by SOTA · AI-assisted documentation review. Selection advice is our assessment; verify current requirements for your deployment.
Import history & original evidence
LangSmith official documentation
An observability and evaluation platform for tracing agent execution, inspecting failures and testing AI application outputs.
Based on official pages and announcements checked on 2026-10-29. No hands-on test, performance benchmark or popularity ranking is claimed.