LangSmith
Trace, evaluate, deploy, and run agents with compute/storage units and a model gateway.
Category: Development & Code · Agent & RAG frameworks
Features
LangSmith is the commercial observability, evaluation, and deployment platform in the LangChain ecosystem. It also works with other agent frameworks and stores runs as traces with selectable retention.
Developer is free for one user and 5,000 traces. Plus costs $39/seat, includes 10,000 traces per organisation, and unlocks deployment and Engine. At scale, trace retention and LCU/LSU costs dominate seat price.
- Tracing, evaluation, and deployment for LLM agents and other frameworks
- Developer plan free for one user and 5,000 traces per month
- Plus: $39/seat, 10,000 traces per organisation, deployment and Engine unlocked
- EU or US cloud or own VPC selectable
- Cloud, hybrid, or self-hosted operation
Prices and plans
| Tier | Price | Period | What you get |
|---|---|---|---|
| Developer | free | Month | 1 seat 5,000 base traces/month 14-day base retention 5 Fleet LCU/month included 5 LCU + 1 LSU sandbox usage and up to 10 sandboxes |
| Plus | $39 | Month | Unlimited seats at per-seat price 10,000 base traces/month per organisation 1 small serverless deployment included 25 Fleet LCU/month Engine, tuned evaluators, and deployment access |
| Trace usage | $0,0005 / $0,005 | Usage | 14-day base retention 400-day extended retention Extended upgrade adds $0.0045 on top of the base trace Multiple events may belong to one trace |
| LCU / LSU usage | $1.50 / $1 | Usage | LCU for compute, Engine, Fleet, deployments, and sandboxes LSU for database, memory, and storage Engine about 5-30 LCU/successful run Tuned perceived error 0.01 LCU/run |
| Enterprise | contact sales | Year | Cloud, hybrid, or self-hosted Custom SSO, ABAC, and RBAC Custom seats/workspaces and SLA EU or US cloud or own VPC |
Limits
Developer includes 5,000 and Plus 10,000 base traces per month. Usage beyond that is metered: one LCU costs $1.50 and one LSU costs $1. Actual consumption depends on agents and resources used; no daily or per-task price is derived.
Similar tools
FAQ
Is LangSmith available for free?
Yes. A permanently free plan is published, not a time-limited trial. 1 seat, 5,000 base traces, 5 Fleet LCU, and 5 LCU + 1 LSU sandbox/month.
Where is LangSmith's vendor based?
LangChain, Inc., based in USA. For data processing and privacy terms the vendor's own contract governs.
Is LangSmith still active?
Active Developer, Plus, and Enterprise offers with trace, deployment, Fleet, Engine, and sandbox metering.
How many plans are documented for LangSmith?
The catalog documents 5 plans with price, billing period, and included features.
Which use case is LangSmith categorized for?
LangSmith is listed in the catalog under “Development & Code.”
Where do the details about LangSmith come from?
Prices, limits, and product details are documented against the listed official vendor page.
How we compare
We compare free access, paid entry, plan limits, features and the listed official sources. Unsourced figures stay marked as not published.
Only confirmed entries appear in the catalog. Prices, plans and limits come from listed official vendor pages. Missing figures stay marked as not published. Result lists are alphabetical by default and can be switched to Free access first; neither is a quality ranking. The vendor page always wins.
Edited and checked by the AI Compare team
Sources
- https://www.langchain.com/pricing
- https://docs.langchain.com/langsmith/administration-overview
- https://docs.langchain.com/langsmith/billing
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