LangSmith Pricing 2026
Plans, hidden costs, and alternatives compared
Cite this data: Toolradar, LangSmith pricing verified Oct 2026, toolradar.com/tools/langsmith/pricing
LangSmith starts at $39/seat/month on the Plus plan.
Verified Oct 2026 from the official pricing page.
Is LangSmith worth the price?
LangSmith Developer is $0 for one seat and 5,000 base traces/month.
Plus is $39/seat/month with 10,000 traces and one free small serverless deploy. After the included traces you pay usage.
Official units: 1 LCU = $1.50 (compute), 1 LSU = $1.00 (storage). Seats bill on the 1st, pro-rated if added mid-month, no credit when you remove a seat.
Traces bill in arrears. They do not train on your data.
Startup credits up to $10,000 exist via an apply form. This is best for a solo tracer at $0, or a team that will actually ship Deployment at $39/seat plus LCUs.
Pricing Plans
Developer
Free
- $0/seat official
- 1 seat
- 5k base traces / month then pay-as-you-go
Plus
$39/month
- $39/seat/month official
- Unlimited seats
- 10k base traces / month then pay-as-you-go
- 1 free small serverless deployment
Enterprise
Custom
- Quote
- Hybrid or self-host
- Custom SSO
Hidden Costs & Gotchas
Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor.
1 LCU = $1.50. 1 LSU = $1.00. Engine, Fleet, sandboxes, and extra deploys burn these.
Base traces last 14 days. Extended traces (400 days) cost extra.
Fleet on Developer pauses after 5 LCU/month until reset or Plus.
Which Plan Do You Need?
$0/seat official. 5k traces.
$39/seat official. Deployment included.
How LangSmith compares
4 of 6 direct competitors offer a free plan.
| Tool | Starting price | Free plan |
|---|---|---|
| LangSmith | $39/seat/month | Yes |
| Langfuse | $59/month, billing unit not specified | Yes |
| Arize AI | $50/month, billing unit not specified | Yes |
| Weights & Biases | $60/month, billing unit not specified | Yes |
| Comet ML | $19/user/month | No |
| OpenAI API | Contact sales | No |
| Google Gemini | Contact sales | Yes |
LangSmith Pricing FAQ
How much does LangSmith cost?
LangSmith starts at $39/seat/month on the Plus plan. A free plan is also available.
Does LangSmith have a free plan?
Yes. LangSmith offers a free plan called "Developer". It includes: $0/seat official, 1 seat, 5k base traces / month then pay-as-you-go.
What are alternatives to LangSmith?
Alternatives to LangSmith include Langfuse, Arize AI, Weights & Biases, Comet ML. Langfuse starts at $59/month, billing unit not specified; Arize AI starts at $50/month, billing unit not specified; Weights & Biases starts at $60/month, billing unit not specified.
How much does LangSmith cost for a team of 10?
For 10 users on the Plus plan, LangSmith is $390/month, or $4,680/year, at the published per-user rate.
LangSmith alternatives
Direct competitors. Starting prices match the table above.
Sources
- Official LangSmith pricing: www.langchain.com/pricing (verified Oct 2026)
- Cite this data: Toolradar, LangSmith pricing verified Oct 2026, toolradar.com/tools/langsmith/pricing
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