What is LangSmith
LangSmith is LangChain's commercial platform for tracing, evaluating, deploying and operating agent and LLM applications.
Plans
As of July 31, 2026, Developer costs US$0 per seat per month plus pay-as-you-go usage and includes one seat, 5,000 base traces per month and community support. Plus costs US$39 per seat per month plus usage, includes 10,000 base traces, unlimited purchasable seats, access to Deployment and Engine, and one free small serverless deployment.
Enterprise uses custom pricing plus usage and adds self-hosted and hybrid deployment, custom SSO and role-based access, support SLA, annual invoicing and custom seats and workspaces. A separate startup programme offers qualified early-stage companies discounts and credits.
Usage pricing
LangSmith prices work and compute in LangChain Compute Units at US$1.50 per LCU and trace or storage usage in LangSmith Storage Units at US$1 per LSU. Seat charges are billed monthly, while trace usage is billed monthly in arrears.
Official sources: LangSmith pricing and billing documentation.