LangSmith Prices, limits and access
Trace, evaluate, deploy, and run agents with compute/storage units and a model gateway.
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At a Glance
LangSmith is an AI tool for Agent & RAG frameworks (category: Development & Code). Free access: Free plan. Paid from $39 (Plus). 4 plans available (Developer, Plus, Trace usage, LCU / LSU usage).
- Category
- Agent & RAG frameworks
- Paid from
- $39 / Month (Plus)
- Free Option
- Free plan
- Plans
- 4 plans available (Developer, Plus, Trace usage, LCU / LSU usage)
- Sources
- 3 verified sources
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
US prices only
| Tier | Price | Period | What you get |
|---|---|---|---|
| Developer | freeBilling period: monthly | 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 | $39Billing period: monthly | 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 salesBilling period: yearly | Year | Cloud, hybrid, or self-hosted Custom SSO, ABAC, and RBAC Custom seats/workspaces and SLA EU or US cloud or own VPC |
Prices as stated by the provider, usually plus statutory VAT. The final price depends on your country and is shown by the provider.
Prices last checked: 2026-10-09
What does LangSmith cost?
Subscription
- Plus 39 USD /month per seat
All details without guarantee. The provider states the binding price including taxes. All 4 plans in the price table
Independent price alert from AI Compare Ninja
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.
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. Search results are ordered by Task match by default; category and task lists are alphabetical. Both can be switched to Free access first; neither is a quality ranking. The vendor page always wins.
Edited and checked by the AI Compare Ninja team
Sources
All details regarding plans, limits, and features are based on official vendor documentation and the primary sources verified below.
- langchain.com/pricing
- docs.langchain.com/langsmith/administration-overview
- docs.langchain.com/langsmith/billing
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 the vendor of LangSmith based?
LangChain, Inc. is based in the USA. Regardless of that location, data processing and privacy terms are governed by the vendor's own contract.
How is LangSmith billed?
Developer includes one seat and 5,000 base traces. Plus costs $39 per seat and includes 10,000 base traces and a small serverless deployment; additional usage is billed separately. There is no currency switch. "US or EU" refers only to the server location for data hosting, not to the price currency. Prices are in US dollars only.
What is “LangChain, Inc.” on my bank or card statement?
According to our catalog data, LangChain, Inc. is the company behind LangSmith, so a charge under this name may come from a subscription or purchase at LangSmith. The exact wording on a bank or card statement is set by the vendor and its payment provider; it can differ and is not recorded here. The invoices in your LangSmith account help to match the charge; for an unknown charge, contact your bank.
How much does LangSmith cost?
The cheapest paid plan of LangSmith is Plus at $39. 4 plans available (Developer, Plus, Trace usage, LCU / LSU usage).
Is LangSmith currently available?
LangSmith is active.
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LangSmith and related names are trademarks or identifiers of their respective owners (LangChain, Inc.). They are named solely for descriptive purposes in an independent comparison. AI Compare Ninja has no business relationship, partnership or affiliation with LangChain, Inc.