LangChain review: Open source agent frameworks plus LangSmith for tracing, evals and deployment
Open source agent frameworks plus LangSmith for tracing, evals and deployment
Starts at $39/mo, free plan: yes, prices checked on October 31, 2026.
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What LangChain does
Provides open source agent frameworks and LangSmith, a platform to trace, evaluate, deploy and govern AI agents.
LangChain is both a family of open source agent frameworks and the name of the company behind LangSmith, a commercial platform that covers the agent development lifecycle. The official site lists three frameworks: deepagents for long-running autonomous agents, langchain for building agents from templates with any model provider, and langgraph for production agents that need low-level control.
LangSmith adds services around those frameworks. These include tracing and evaluation for testing and monitoring, a deployment service for long-running agents, Fleet for creating agents in everyday language, Engine for finding production issues, Sandboxes for running agent-generated code in isolation, and an LLM Gateway for cost controls and handling of sensitive data.
Pricing combines per-seat plans with usage-based charges. The Developer plan is $0 per seat per month, limited to 1 seat, with 5k base traces per month included. The Plus plan is $39 per seat per month, includes 10k base traces per month and allows unlimited seats. Usage beyond the included amounts is pay-as-you-go, metered in LangChain Standard Units (LSUs) at $1.00 per LSU. Enterprise uses custom pricing and adds self-hosted and hybrid deployment, custom SSO and a support SLA. Seats are billed monthly, while Enterprise is invoiced annually. Base traces are retained for 14 days and extended traces for 180 days.
- Step-by-step agent tracing
- Evals built from expert review
- Deployment for long-running agents
- Isolated sandboxes for agent-generated code
- Fleet: agents from everyday language
- Engine: automatic production issue detection
- LLM Gateway cost and data controls
- SaaS, BYOC or self-hosted options
Official video
How Clay manages 300M agent runs a month with LangSmith · by LangChain
The player loads only when you press play.
Good for / Not for
Good for
- Engineering teams building long-running or production agents who want tracing and evals in one place
- Solo developers who want to try LangSmith on the free Developer plan
- Organizations that need self-hosted or hybrid deployment through Enterprise
Not for
- Teams wanting more than 1 seat on the free plan
- Buyers who need a published Enterprise price
How to start
Start on the Developer plan with the Start for free button: $0 per seat per month, 1 seat. source
Use the usage calculator on the pricing page to estimate monthly cost from traces and seats. source
Upgrade to Plus from the Plans and Billing page when you need more seats or Deployment. source
Contact sales for Enterprise needs such as self-hosting. source
Limits and gotchas
- Developer includes up to 5k base traces per month; Plus includes up to 10k; then pay-as-you-go. source
- Base traces are retained for 14 days; extended traces for 180 days at an additional fee. source
- Usage is metered in LSUs at $1.00 each, and the page says estimates vary with the work agents perform. source
- Enterprise plans are invoiced annually upfront. source
From the official site and docs of LangChain, checked on October 31, 2026.
Pros and cons
Pros
- Free Developer plan at $0 per seat per month with 5k base traces included
- Open source frameworks (deepagents, langchain, langgraph) work with any model provider
- Covers tracing, evals, deployment, sandboxes and an LLM Gateway under one platform
- Enterprise offers self-hosted and hybrid deployment options
- States that LangSmith does not use your data to train models
Cons
- Developer plan is limited to 1 seat
- Plus costs $39 per seat per month, so costs grow with team size
- Usage beyond included traces is pay-as-you-go in LSUs, making the monthly bill variable
- Base traces are kept only 14 days unless upgraded to extended traces for an additional fee
- Enterprise has no published price and requires contacting sales
Our take
LangChain suits engineering teams that already build agents and want one vendor for tracing, evals, deployment and governance, with open source frameworks underneath. The Developer plan lets a single person try LangSmith at no seat cost. The trade-offs are a pricing structure with several layers: seat fees, trace volume and LSU metering that the page itself calls an estimate. Teams that need self-hosting or custom SSO must go through sales. It is not a fit for buyers who want a single flat monthly price, or who need more than one seat without paying for it.
Comparisons and lists with LangChain
Coming soon
Coming soon — we are writing comparisons that include LangChain.
LangChain pricing
| Plan | Monthly billing | Annual billing (per month) | Limits / what’s included |
|---|---|---|---|
| Developer per seat | Free | — | 1 seat; up to 5k base traces / mo, then pay-as-you-go; community support |
| Plus per seat | $39 | — | Up to 10k base traces / mo, then pay-as-you-go; unlimited seats; access to Deployment and Engine |
| Enterprise custom pricing | — | — | Self-hosted and hybrid deployment, custom SSO, support SLA, custom seats and workspaces |
Free trial: none listed. Free plan: yes.
Prices checked on on the official LangChain pricing page. “—” = not published.
All LangChain plans, limits and annual prices →
Frequently asked questions
Is there a free plan?
Yes. The Developer plan is $0 per seat per month, limited to 1 seat, with 5k base traces per month included and pay-as-you-go beyond that.
How much does the Plus plan cost?
Plus is $39 per seat per month with 10k base traces per month included. Unlimited seats can be added, and extra usage is pay-as-you-go.
What is an LSU?
LangChain Standard Units are the unit for usage across LangSmith products. The pricing page states 1 LSU = $1.
Can I self-host?
Self-hosted and hybrid deployment options are listed for the Enterprise plan, which requires contacting sales.
How long are traces kept?
Base traces are kept for 14 days and extended traces for 180 days. Upgrading a base trace to an extended trace costs an additional fee.
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