What is LangChain
LangChain develops open-source agent frameworks and LangSmith, its commercial platform for tracing, evaluation, deployment and operating agent applications.
LangSmith plans
As of July 31, 2026, Developer costs US$0 per seat per month plus pay-as-you-go usage and includes one seat and 5,000 base traces. Plus costs US$39 per seat per month plus usage, includes unlimited seats, 10,000 base traces and one free small serverless deployment. Enterprise uses custom pricing plus usage and can add self-hosted or hybrid deployment, SSO, role-based access, an SLA and annual invoicing.
Usage and deployment
LangSmith meters deployment resources in LangChain Compute Units (LCU), priced at US$1.50 per LCU, and storage in LangSmith Storage Units (LSU), priced at US$1 per LSU. Published deployment rates include 0.045 LCU per vCPU-hour and 0.006 LCU per GiB-hour of runtime memory; database compute is 0.177 LSU per vCPU-hour and database memory is 0.025 LSU per GiB-hour.
Developer includes five fleet LCU and Plus includes 25. Tracing, evaluation, sandbox, storage and additional deployment usage are charged according to the current metering table.
Official source: LangChain pricing.