Opik
Comet's open-source platform for tracing, evaluating and monitoring LLM apps, RAG systems and agent workflows, self-hosted or in the cloud.
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About Opik
Opik is listed in our evals & observability category and is aimed at builders. Comet's open-source platform for tracing, evaluating and monitoring LLM apps, RAG systems and agent workflows, self-hosted or in the cloud. Pricing, as the maker states it: Open source + cloud. Maturity: Mature. We last checked the official link on 2026-10-18.
What is Opik?
Opik is an open-source LLM observability and evaluation platform from Comet, for AI agent tracing, LLM evaluation, prompt management and production monitoring.
It is Apache-2.0 licensed and the full platform is free to self-host. It includes a client SDK for logging traces and LLM-as-a-judge evaluations; Comet also offers a hosted version.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: comet.com/site/products/opik.
Who is Opik for?
Teams building LLM apps and agents who need to trace calls, evaluate output quality and monitor production, with the option to self-host.
Opik at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: comet-ml/opik · 22,795 stars (as of Oct 21, 2026)
Key features
- Tracing for LLM calls and AI agents
- LLM evaluation, including LLM-as-a-judge
- Prompt management
- Production monitoring
- Free to self-host (Apache-2.0); hosted option by Comet
Opik FAQ
What is Opik?
Opik is an open-source LLM observability and evaluation platform from Comet, for AI agent tracing, LLM evaluation, prompt management and production monitoring.
Who is Opik for?
Teams building LLM apps and agents who need to trace calls, evaluate output quality and monitor production, with the option to self-host.
Is Opik free?
Opik's pricing, as the maker states it: Open source + cloud. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is Opik open source?
Yes. Opik is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to Opik?
Similar tools include MLflow, Arize Phoenix, Langfuse, Future AGI, Kiln and Laminar.
Opik ratings and reviews
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Opik alternatives
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Arize Phoenix
Open-source tracing and evaluation for LLM apps.
Langfuse
Open-source LLM observability, tracing and evals.
Future AGI
Open-source platform for evaluating, tracing, simulating and guarding LLM and AI agent applications, self-hostable or cloud.
Kiln
Free desktop app and open-source library for building AI systems with evals, RAG, agents, fine-tuning and synthetic data in one workbench.
Laminar
Open-source observability platform for AI agents with OpenTelemetry tracing, plain-English behavior tracking and alerts.
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