LangChain (LangSmith)
LangSmith (Plus)
Tracing and evals for LangChain/LangGraph and other stacks; $39 per seat plus per-trace charges. Sample normalisation.
USD per month at 1M traced events
$450.00
#4 cheapest of 4 in LLM observability & evals
Official pricing ↗Capabilities, explained
What this API can do, and what each capability means for your project.
Evaluations
Yes
Built-in datasets, experiments or scorers for testing quality.
Prompt management
Yes
Versioned prompts you can edit and deploy without a code release.
Open source
No
The platform's code is open, so you can inspect or self-host it.
Self-hosting
Yes
You can run it in your own cloud for data-residency or compliance needs.
Retention on the priced plan
—
How long traces are kept on the plan used for the headline price.
Free tier
Yes
A permanent free plan exists.
Price history
Only one price recorded so far. The chart appears once the price changes.