kitio.aiLangSmith vs Opik
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Opik has the lower starting price: about $19 a month, against $39 for LangSmith.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Agent tracing
- Datasets and evaluators
- Prompt hub
- Agent deployment
- Online monitoring
- Tracing and spans
- Evaluation metrics
- Agent optimizer
- Guardrails
- Framework integrations
| Feature | LangSmith | Opik |
|---|---|---|
| Best for | Tracing, evaluation and deployment platform for LLM agents | Comet's open-source platform for LLM tracing and evaluation |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $39/mo | $19/mo |
| Free plan | Yes | Yes |
| Made by | LangChain | Comet |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Opik has the lower starting price: about $19 a month, against $39 for LangSmith.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Developer
Free
- 1 seat
- 5k base traces / month, then pay as you go
- Community support
Plus
$39/mo
- Per seat
- 10k base traces / month, then pay as you go
- Access to Deployment and Engine
- Unlimited seats
Enterprise
Custom
- Self-hosted and hybrid deployment
- Custom SSO, ABAC and RBAC
- Support SLA
4 plans
Open Source
Free
- Self-hosted
- Full observability feature set
- Unlimited spans
Free Cloud
Free
- Up to 10 team members
- 25k spans per month
- 60-day data retention
Pro Cloud
$19/mo
- Up to 50 team members
- 100k spans per month
- $5 per extra 100k spans
Enterprise
Custom
- Unlimited team members
- Flexible deployments
- Single sign-on
- 2-hour response SLA
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
LangSmith
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
- Per-seat pricing adds up
- Trace retention costs extra
- Self-hosting is enterprise-only
Opik
- Free and self-hostable
- Automatic prompt optimization
- Many integrations
- Smaller community than Langfuse
- Hosted plan limits vary
- Docs split with Comet ML
Which one should you choose?
Choose LangSmith if you want:
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
Watch out: per-seat pricing adds up.
Choose Opik if you want:
- Free and self-hostable
- Automatic prompt optimization
- Many integrations
Watch out: smaller community than langfuse.
LangSmith vs Opik FAQ
What is the difference between LangSmith and Opik?
LangSmith: Tracing, evaluation and deployment platform for LLM agents. Opik: Comet's open-source platform for LLM tracing and evaluation. Both are models & apis tools.
Is LangSmith or Opik cheaper?
Opik has the lower starting price: about $19 a month, against $39 for LangSmith.
Do LangSmith and Opik have free plans?
LangSmith: Yes. Opik: Yes.
Who makes LangSmith?
LangSmith is made by LangChain, based in United States.
Who makes Opik?
Opik is made by Comet, based in United States.
Which should I choose, LangSmith or Opik?
Choose LangSmith if you value detailed agent traces and strong langgraph integration. Choose Opik if you value free and self-hostable and automatic prompt optimization.