📖 The AI Tool Bible

Braintrust vs Opik

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
Braintrust
Evaluation
Opik
Evaluation
TaglineEval, monitor, and improve AI products end-to-end.Open-source LLM observability and evaluation platform for debugging and monitoring AI agents in production.
CategoryEvaluationEvaluation
PricingFreemium· Free up to 1k events/day; team from $249/moFreemium· Free open-source self-host; free Cloud tier (no card); Enterprise contact sales
ModelPlatform (any LLM)Multi-model
Editorial score8.9 / 10—
Use cases
evalsmonitoringprompt management
llm-tracingagent-evaluationprompt-testingproduction-monitoringguardrailscost-tracking
Pros
  • Full eval + observability in one tool
  • Excellent UX
  • Strong dataset/experiment tracking
  • Closed loop dev → prod
  • Fully open-source with permissive self-hosting
  • 30+ built-in LLM-as-a-Judge evaluation metrics
  • Broad SDK and framework integrations (LangChain, LlamaIndex, LiteLLM, CrewAI)
  • Production guardrails plus PII protection out of the box
  • Free Cloud tier with no credit card required
Cons
  • Team pricing is steep
  • Smaller than LangSmith ecosystem-wise
  • Feature surface area is wide; non-trivial onboarding
  • Self-hosting at scale still requires real infra work
  • Ollie auto-fix agent is newer and less battle-tested
  • Cost dashboard is most useful if you're already on Claude Code
Websitewww.braintrust.devcomet.com
Pick Braintrust if
  • ✅ Full eval + observability in one tool
  • ✅ Excellent UX
  • ✅ Strong dataset/experiment tracking
  • ✅ Closed loop dev → prod
Pick Opik if
  • ✅ Fully open-source with permissive self-hosting
  • ✅ 30+ built-in LLM-as-a-Judge evaluation metrics
  • ✅ Broad SDK and framework integrations (LangChain, LlamaIndex, LiteLLM, CrewAI)
  • ✅ Production guardrails plus PII protection out of the box
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