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Head-to-head · LLM Observability Tools

Opik vs LangSmith

  • Updated Oct 2026
  • Both researched from official sources
  • 8 checks side by side
Higher score Opik #4 in LLM Observability Tools 9.1/10 Free plan Free plan✓ 6 of 6 features Visit Opik
LangSmith #6 in LLM Observability Tools 8.9/10 Free plan Free plan✓ 6 of 6 features Visit LangSmith

Opik leads on 1 check, LangSmith on 0, and 7 are even. Who comes out ahead on the 8 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreOpik · 9.1/10
  • Lowest starting priceOpik · $19/mo
  • Free planboth

Opik scores higher on our rubric for llm observability tools: 9.1 against 8.9 out of 10; our editors rank them #4 and #6.

Opik is cheaper to start at $19/mo against $39/mo.

Opik is the better fit for cost-conscious teams needing full-stack observability. LangSmith is the better fit for langChain-centric teams needing an integrated platform.

  • Opik fits best

    Cost-conscious teams needing full-stack observability

  • LangSmith fits best

    LangChain-centric teams needing an integrated platform

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Opik 9.1/10 Visit ↗ LangSmith 8.9/10 Visit ↗
At a glance
Editor score 9.1 8.9
Ranking #4 in LLM Observability Tools #6 in LLM Observability Tools
Best for Cost-conscious teams needing full-stack observability LangChain-centric teams needing an integrated platform
Pricing model Free plan + paid Free plan + paid
Starting price $19/mo (best) $39/seat/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Community, Docs Community, Email, Tickets, Docs · 24/7
Compliance SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML
Integrations 40+ integrations 7 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Opik 6/6 · LangSmith 6/6
LLM tracing ✓ ✓
LLM evaluations ✓ ✓
Prompt management ✓ ✓
Agent tracing ✓ ✓
Retrieval tracing ✓ ✓
Token cost tracking ✓ ✓
Specs
Deployment options Both Both
Our review
Pros
  • Free self-hosted and cloud options cover core observability needs
  • Traces model calls, tools, retrieval steps, and agent actions
  • Tracks evaluations, prompts, human feedback, tokens, and model costs
  • Tracing, evaluations, prompt management, datasets, and monitoring in one platform
  • Agent and tool-call tracing alongside human feedback workflows
  • Cloud, hybrid, and self-hosted deployment options
Cons
  • Enterprise pricing is custom rather than published
  • Self-hosted deployment requires your own infrastructure
  • Its broad scope may exceed teams needing only basic tracing
  • Usage-based charges apply after included trace allowances
  • Enterprise pricing is custom
  • Named integrations are narrower than some alternatives
Our verdict

Opik is an open-source LLM observability and evaluation platform from Comet for teams building chatbots, retrieval-augmented generation pipelines, and multi-step agents. It records model calls, tool invocations, retrieval steps, and agent…

Read the review →

LangSmith is a commercial platform for developing, testing, monitoring, evaluating, and deploying LLM applications and agents. It is particularly suited to teams building with LangChain or LangGraph, while also supporting applications…

Read the review →
  1. OpikLLM Observability Tools 9.1Free plan
  2. LangSmithLLM Observability Tools 8.9Free plan

Strengths and trade-offs

  • Opik — where it wins

    • Free self-hosted and cloud options cover core observability needs
    • Traces model calls, tools, retrieval steps, and agent actions
    • Tracks evaluations, prompts, human feedback, tokens, and model costs

    Where it doesn't

    • Enterprise pricing is custom rather than published
    • Self-hosted deployment requires your own infrastructure
    • Its broad scope may exceed teams needing only basic tracing

  • LangSmith — where it wins

    • Tracing, evaluations, prompt management, datasets, and monitoring in one platform
    • Agent and tool-call tracing alongside human feedback workflows
    • Cloud, hybrid, and self-hosted deployment options

    Where it doesn't

    • Usage-based charges apply after included trace allowances
    • Enterprise pricing is custom
    • Named integrations are narrower than some alternatives
  • Opik9.1/10 · Free plan

    A broad, cost-conscious stack for tracing, evaluation, prompts, monitoring, and agent debugging.

    Visit OpikFull verdict →
  • LangSmith8.9/10 · Free plan

    A broad LLM observability platform with especially strong LangChain ecosystem fit.

    Visit LangSmithFull verdict →

More comparisons

All LLM observability tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update