LangSmith
Trace agent behavior, debug failures, and monitor production metrics across common development stacks.
About LangSmith
LangSmith gives teams a detailed view of how AI agents and LLM applications behave in practice. Traces connect an agent run with its model calls and tool calls, making execution paths, failures, latency, token use, and cost easier to inspect. Prebuilt dashboards cover common production signals, while custom dashboards let teams arrange charts around their own operating metrics. Python, TypeScript, Go, and Java SDKs support a range of agent stacks. The Developer plan suits a single builder trying the workflow; Plus adds team seats, more included traces, email support, and access to additional LangSmith services. Because usage above the included trace allowance is billed separately, high-volume teams need to account for compute and storage consumption. Enterprise adds custom pricing, self-hosted or hybrid deployment, SSO, RBAC, support SLAs, and configurable workspaces for stricter hosting and access needs.
Best for
Best use cases
Investigate an unexpected agent response by following its nested model and tool calls through one trace.
Track production error rates, latency, token use, and cost trends on prebuilt or custom dashboards.
Run LangSmith inside controlled infrastructure when cloud-only hosting does not meet organizational requirements.
Compare before choosing
The Developer plan removes seat cost for one user, but usage above 5,000 monthly base traces is billed separately.
Plus supports unlimited paid seats and doubles the included base traces, making collaboration easier at a recurring per-seat cost.
Enterprise adds hosting and access-control options unavailable in the lower plans, but requires a sales conversation for pricing.
Features
Trace agent execution
Inspect each agent run and its nested model or tool calls to understand execution paths, latency, errors, and token use.
Monitor production health
Use prebuilt or custom dashboards to follow trace volume, error rates, latency, costs, tokens, tool calls, and feedback trends.
Debug failures faster
Review detailed traces when an agent behaves unexpectedly so engineering teams can locate the failing step and compare behavior across runs.
Pros
- The free Developer plan gives one builder 5,000 base traces per month before usage charges begin.
- Tracing and dashboards connect execution details with latency, error, token, cost, tool, and feedback metrics.
- SDKs for Python, TypeScript, Go, and Java reduce compatibility friction across varied agent stacks.
Cons
- Base trace allowances are capped, so active workloads can incur pay-as-you-go compute and storage costs.
- The free tier is limited to one seat, while team collaboration starts at $39 per seat each month.
- Self-hosted or hybrid deployment, custom SSO, RBAC, and support SLAs require the custom-priced Enterprise plan.
Pricing Plans
Developer
- One seat
- Up to 5,000 base traces per month, then pay as you go
- Community support
Plus
- Unlimited seats at $39 per seat per month
- Up to 10,000 base traces per month, then pay as you go
- Access to Deployment, Engine, and more
- Email support
Enterprise
- Self-hosted and hybrid deployment options
- Custom SSO and RBAC
- Support SLA
- Custom seats and workspaces
* Pricing information is for reference only. Please refer to the latest announcement on LangSmith's official website.