Opik
Verified Oct 2, 2026 ActiveOpen-source platform from Comet for tracing, testing and monitoring LLM applications and agents, self-hosted or in the cloud.
Listed on EffectHub ·
Pricing
- Pricing model
- Freemium
- Paid options from
- $19/mo
- Billing
- Monthly
Self-hosting the open-source version is free. Comet's cloud has a Free plan (10 team members, 25k spans a month, 60-day retention), Pro at $19 a month (up to 50 members, 100k spans a month) and a custom Enterprise plan with SSO and compliance options.
Use tool ↗About Opik
Opik records every step an LLM application or agent takes, including model calls, retrieval and tool use, so teams can debug failures and compare versions. It adds test suites with pass-or-fail assertions, LLM-as-a-judge metrics, annotation queues for reviewers, production monitoring with alerts and guardrails, and a cost view for coding-agent usage. Integrations cover more than 40 frameworks and providers, plus OpenTelemetry. The same Apache-2.0 codebase can be self-hosted or used as a hosted service from Comet ML, which also sells experiment-tracking tools.
- Platforms
- Web · API
- API
- Yes
- Last verified
- Oct 2, 2026
Verified sources
- Product features: tracing, test suites, monitoring, integrations, open-source versioncomet.com ↗
- Open source, Free, Pro and Enterprise plans with span limits and retentioncomet.com ↗
- Operator Comet ML, Inc., New York, in the privacy policycomet.com ↗
- Open-source repository under Apache-2.0github.com ↗
Is Opik legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Last checked
- Oct 2, 2026The site answered
- Operated by
- Comet ML, Inc., United StatesOur research, card verified Oct 2, 2026
Pros & cons of Opik
Opik is a solid pick for teams that want tracing and evaluation for LLM apps without being locked into a closed service, since the open-source code matches the hosted product. The $19 Pro plan is cheap for a small team, and the test-suite approach makes regression checks approachable. It overlaps heavily with Langfuse and LangSmith, so the choice often comes down to your stack and hosting preference.
Pros
- Open-source codebase that matches the hosted version
- Covers tracing, evaluations, annotation and production monitoring in one product
- Integrates with 40+ frameworks and model providers plus OpenTelemetry
- Free cloud plan with 25k spans a month and a $19 Pro tier
Cons
- Cloud plans are metered in spans, so chatty agents can hit limits quickly
- Free and Pro plans keep data for 60 days
- SSO, service accounts and compliance coverage need the Enterprise plan
Best for
- Developers who want to self-host LLM tracing and evaluation under Apache-2.0
- Small teams that need agent tracing and regression tests for a few dollars a month
- Teams that already use Comet for experiment tracking
Not for
- Teams that only need uptime or infrastructure monitoring and have no LLM workloads
- Buyers who want a fixed enterprise price list for SSO and compliance features
Watch out: Span quotas (25k on Free, 100k on Pro) count every logged step, so multi-step agents use them faster than request counts suggest; Pro allows custom limits at extra cost.