LLM & agent observability
LangSmith pricing
LangChain's tracing/evals platform: seats plus usage metered in LangChain Standard Units (LSUs).
Published pricing Active Last checked 2026-10-19
- Free tier
- Developer: $0, 1 seat, 5K base traces/month, then pay-as-you-go.
- Pricing page
- https://www.langchain.com/pricing
- Self-host / OSS
- Cloud only
- Currency
- USD
Plans
| Plan | Price | Notes |
|---|---|---|
| Developer | $0 / seat | Max 1 seat, 5K base traces/mo |
| Plus | $39 / seat / mo | 10K traces included, then 0.005 LSU ($0.005) per additional base trace |
| Enterprise | Contact sales |
Tier breakpoints
Base traces (14-day retention) (billed per traces)
| Developer | |
|---|---|
| Up to 5K traces | $0/mo |
| Plus (1 seat) · $39/mo base | |
|---|---|
| 0 – 10K traces | Free |
| 10K – ∞ traces | $5000 per 1M traces |
Verified with LangSmith's own calculator: 100K traces = $489/mo, 1M = $4,989/mo (1 seat). Extended (180-day) traces cost extra. Add $39 per extra seat.
Estimated monthly cost
| LLM & agent observability: traces / month | Estimate | Plan |
|---|---|---|
| 100K | $489 | Plus (1 seat) |
| 1M | $4,989 | Plus (1 seat) |
| 10M | $49,989 | Plus (1 seat) |
Try your own volume → LangSmith alternatives
Estimate, check vendor page. Figures are list prices computed from publicly posted pricing on the "last checked" date. They exclude taxes, discounts, add-ons, seats and contract terms unless stated. Always confirm on the vendor's own pricing page.
Notes
- 1 LSU = $1. Contact sales for volume discounts.
History
- Pricing snapshot baseline capturedbaseline
Sources
- LangSmith pricing page retrieved 2026-10-19
Raw snapshots in the repo: data/snapshots/langsmith/2026-10-19.htmldata/snapshots/langsmith/2026-10-19.md