Opik
Comet's open-source platform for tracing, evaluating, and monitoring LLM applications.
Opik, from Comet, is an open-source platform covering the full loop: tracing LLM and agent runs, running evaluations, and monitoring in production, with a prompt playground alongside.
It is self-hostable, and brings Comet's experiment-tracking heritage to the LLM observability space.
Where it fits
A fit when you want an open-source, self-hostable platform spanning tracing, evals, and production monitoring.
Where it does not fit
A younger project than the most established observability tools: weigh ecosystem depth before committing.
Alternatives to Opik
The closest options on the map, and where each fits instead.
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Langfuse LLM observability
A strong default whenever an AI system reaches production and you need to see what it actually did, call by call.
Unlike Opik Maturity: established
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Phoenix LLM observability
A fit when you want open, OpenTelemetry-based tracing and evaluation with a focus on debugging agent behaviour.
Unlike Opik Source availableNo hosted API
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Helicone LLM observability
A fit when you want fast, low-effort visibility into model calls, costs, and latency through a simple proxy.
Unlike Opik Maturity: established
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LangSmith LLM observability
A natural fit when a project is built on LangChain or LangGraph and you want tracing and evals from the same ecosystem.
Unlike Opik ProprietaryNot self-hostableMaturity: established
Pairs with
Commonly used alongside it.
