LangSmith
langchain.com
LangChain's platform for testing, debugging, and monitoring LLM applications.
Quick Information
- Category:
- Coding
- Pricing:
- Freemium
- Platforms:
- Web
- Free Plan:
- Yes
- API Available:
- Yes
- Last Verified:
- September 2026
What Is LangSmith?
LangSmith is LangChain's platform for testing, debugging, and monitoring LLM applications, with a free Developer plan (one seat, 5,000 base traces/month) and a Plus plan at $39/seat/month (10,000 base traces included); Enterprise is custom-priced. Beyond included allowances, base traces with 14-day retention cost $2.50 per 1,000 and extended traces with 400-day retention cost $5.00 per 1,000 — note that many third-party guides still cite an outdated $0.50 per 1,000 base trace price, so verify current rates directly on LangSmith's pricing page.
A significant restructuring occurred July 29, 2026: LangSmith changed support entitlements without altering price — Plus lost direct email support in favor of a self-serve Support Portal, while Enterprise gained a new Slack channel alongside its existing email support and SLA. The same July 2026 repricing also replaced Deployment's per-run/uptime charges and Fleet's per-run charges with resource-based LCU (LangChain Compute Unit) and LSU (LangChain Storage Unit) metering.
It's aimed at teams building LLM applications who need tracing, evaluation, and debugging tools tightly integrated with the LangChain ecosystem, with the July 2026 trace price increase (from $0.50 to $2.50 per 1,000) and support restructuring being important recent changes to factor into both budgeting and support expectations. See our Developer Tools directory for related tools like Langfuse.
What Can You Use LangSmith For?
LLM application testing
Tests LLM application behavior before and during production deployment.
LLM debugging
Debugs LLM application issues using detailed tracing.
LLM application monitoring
Monitors LLM applications in production using resource-based metering.
LangSmith Features
- Tracing — Traces LLM application calls with configurable retention periods.
- LCU/LSU metering — Meters Deployment and Fleet usage via resource-based Compute and Storage Units.
- Support Portal — Provides self-serve support for Plus-tier users, replacing direct email support.
Who Is LangSmith For?
- LangChain developers — Tests, debugs, and monitors LLM applications tightly integrated with the LangChain ecosystem.
- Enterprise teams — Uses custom pricing and dedicated Slack/email support with SLA for large-scale deployments.
LangSmith Pros & Limitations
What We Like
- Free Developer plan’s 5,000 traces/month allows meaningful initial evaluation
- Tight integration with the broader LangChain and LangGraph ecosystem
- Enterprise tier gained expanded support (new Slack channel) in the July 2026 restructuring
Limitations
- Trace pricing increased fivefold (from $0.50 to $2.50 per 1,000) as of the current official rate — many third-party guides still cite the outdated price
- Plus tier lost direct email support in July 2026, now relying on a self-serve Support Portal
- Resource-based LCU/LSU metering makes total cost less predictable than flat per-run pricing
LangSmith Pricing
| Plan | Price | Main Features |
|---|---|---|
| Developer | Free | 1 seat, 5,000 base traces/month |
| Plus | $39/seat/month | 10,000 base traces included, self-serve Support Portal |
| Enterprise | Custom | Dedicated Slack channel, email support, SLA |
Pricing was last verified September 2026. Check the official website for the latest pricing.
AI Listing Jungle Ranking
- Global Rank:
- #780
- Overall Score:
- 10.3/100
- Monthly Users:
- –
- Rank Change:
- ▼ 3
This ranking reflects AI Listing Jungle's own independent scoring methodology and is not an endorsement by LangSmith or its company. How Our Rankings Work
Frequently Asked Questions
How much does a LangSmith trace cost?
Currently $2.50 per 1,000 base traces (14-day retention) — note many older guides cite an outdated $0.50 rate.
What changed in July 2026?
Support entitlements were restructured (Plus moved to self-serve support, Enterprise gained a Slack channel), and Deployment/Fleet billing shifted to LCU/LSU metering.
Is there a free plan?
Yes, the Developer plan is free with 5,000 base traces/month for one seat.
How much does Plus cost?
$39/seat/month with 10,000 base traces included, plus usage-based overage.
Our Take
LangSmith's July 2026 trace price increase (from $0.50 to $2.50 per 1,000) is a substantial change worth confirming directly, since many third-party guides still cite the outdated rate.
The shift to self-serve support on Plus means teams needing direct support responsiveness should factor that into their tier choice.
LangSmith Alternatives
LangSmith Comparisons
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