Comet Opik
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An open-source platform for LLM evaluation, tracing, and production monitoring, from the team behind the Comet ML experiment-tracking tool.
Overview
Opik is the Comet open-source entry for LLM observability: trace agent and LLM calls, run evals with built-in and custom metrics, and monitor quality and cost in production. Coming from a company with a long history in ML experiment tracking, it carries that evaluation discipline into the LLM world, and being open-source and self-hostable suits enterprises with data-residency requirements. It competes directly with Langfuse and the other tracing platforms; the practical decision usually comes down to ecosystem fit and whether you already use Comet.
Pros & Cons
Pros
- Open-source tracing, evals, and monitoring
- Backed by an established ML tooling company
- Self-hostable for data residency
- Built-in and custom evaluation metrics
Cons
- Crowded category with strong alternatives
- Self-hosting adds operational work
- Choice often comes down to ecosystem fit
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