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Opik

LLM evaluation and tracing by Comet

Opik is an open-source LLM evaluation and tracing platform by Comet ML for debugging, testing, and monitoring AI applications. Provides detailed traces of LLM calls with latency, token usage, and cost tracking. Features automated evaluation with built-in and custom metrics, dataset management for regression testing, and production monitoring dashboards. Integrates with the broader Comet ML experiment tracking ecosystem. Available as both self-hosted open-source and managed cloud service.

About Opik

Opik provides LLM observability from the Comet ML ecosystem. Detailed tracing captures every step of LLM application execution with inputs, outputs, latency, and costs.

Automated evaluation with built-in metrics (faithfulness, relevancy, hallucination) and custom scorers. Dataset management enables systematic regression testing across application versions.

Production monitoring dashboards track quality, latency, and cost metrics over time. Integrates with Comet ML's broader experiment tracking for ML teams.

Open-source with self-hosted option. Comet Cloud provides managed deployment with additional features.

Pricing & Platform Specs

Pricing Summary

Opik is open-source under the Apache-2.0 license for self-hosting. Comet-hosted Opik Cloud includes a free tier for up to 10 team members, a Pro tier at $19/user/month for up to 50 users, and custom Enterprise deployments.

full pricing breakdown →

Supported Platforms

Python, Self-hosted, Docker, Cloud

Explore categories, tags & use cases

Alternatives

All Opik alternatives →

Lightweight server monitoring with Docker stats and alerts

Beszel is a lightweight, self-hosted server monitoring platform built in Go that tracks CPU, memory, disk, network, GPU, temperature, and Docker container metrics with historical data visualization and configurable alerts. Its simple hub-and-agent architecture deploys in minutes and consumes minimal resources compared to traditional monitoring stacks like Prometheus and Grafana.

freeOpen Source

Open-source LLM gateway with built-in optimization and A/B testing

TensorZero is an open-source LLMOps platform in Rust that unifies an LLM gateway, observability, prompt optimization, and A/B experimentation in a single binary. It routes requests across providers with sub-millisecond P99 latency at 10K+ QPS while capturing structured data for continuous improvement. Supports dynamic in-context learning, fine-tuning workflows, and production feedback loops. Backed by $7.3M seed funding, 11K+ GitHub stars.

freeOpen Source

Side-by-Side Comparisons

Opik logo
Opik
vs
Langfuse logo
Langfuse

Opik vs Langfuse: AI Optimization Suite or Open LLM Platform?

Opik and Langfuse are two credible open-source choices for tracing, evaluating, and improving LLM applications and agents. Opik, from Comet, combines observability, test suites, assertions, prompt experiments, production monitoring, and automatic prompt optimization. Langfuse combines agent and application tracing, prompt management, datasets, online and offline evaluation, feedback, and mature self-hosting. Langfuse serves as the more practical daily standard because it has the broader adoption base, a particularly complete prompt-and-observability workflow, and flexible free or managed deployment. Opik is the better specialist when built-in optimization algorithms and the Comet ecosystem are decisive.

Community experience

Sources & verification

Sources checked
Content verified

Verification dates are editorial checks. Routine CMS saves and automatic updatedAt timestamps do not advance them.

FAQ

What is Opik?

Opik is an open-source LLM evaluation and tracing platform by Comet ML for debugging, testing, and monitoring AI applications. Provides detailed traces of LLM calls with latency, token usage, and cost tracking. Features automated evaluation with built-in and custom metrics, dataset management for regression testing, and production monitoring dashboards. Integrates with the broader Comet ML experiment tracking ecosystem. Available as both self-hosted open-source and managed cloud service.

Is Opik free?

Opik offers a free tier alongside paid plans. Opik is open-source under the Apache-2.0 license for self-hosting. Comet-hosted Opik Cloud includes a free tier for up to 10 team members, a Pro tier at $19/user/month for up to 50 users, and custom Enterprise deployments.

Is Opik open source?

Yes — Opik is open source.

Is Opik still maintained?

Yes — Opik is active. Its listing was last verified on August 26, 2026.

What are the best Opik alternatives?

The first editor-selected Opik alternatives are Beszel, TensorZero.

How does Opik score in our review?

The published editorial review lists Opik at 81/100 overall across speed, privacy, and developer experience. Check the review's evidence status and test metadata for its verification level.