LangSmith
Tracing, evaluation and monitoring for LLM apps and agents, with SDKs for several languages
Observability tool by LangChain
Install
Pick your client. Read the repository before you give any tool access to your data.
pip install langsmith
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About
Use cases: monitoring-observability, llm-evaluation
Reviews
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Fact sheet
- Category
- Tracing
- Self-host
- Yeslangchain.com
- Open source
- Yesgithub.com
- Regions
- EUraw.githubusercontent.com
- Works with
- crewai, vercel-ai-sdk, pydantic-aidocs.langchain.com
- Protocols
- opentelemetrylangchain.com
Plans
| Developer | $0 | 1 seat, 5k base traces/mo then pay-as-you-go |
|---|---|---|
| Plus | $39/month | per seat; 10k base traces/mo then pay-as-you-go; unlimited seats |
| Enterprise | Contact sales | custom pricing; self-hosted and hybrid options, custom SSO, support SLA |
From the vendor's pricing page, read Oct 24, 2026.
Facts read from the vendor's own pages by claude-haiku-5-5 on Oct 24, 2026; a fact is shown only with the page it came from.
Signals
- Stars
- 17
- Forks
- 14
- Open issues
- 16
- Last commit
- Oct 24, 2026 (4 days ago)
- Last release
- Oct 21, 2026 (7 days ago)
From GitHub (fetched Oct 24, 2026).
Details
- Packages
- pypi
langsmithnpmlangsmith - License
- MIT
- Repository
- github.com/langchain-ai/langsmith-python
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
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Cite this page
LangSmith. Agent Mart. https://agentmart.dev/observability/langsmith (last updated 2026-10-24)