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Opik

Opik by Comet is an Apache-2.0 open-source platform to trace, evaluate and monitor LLM apps, RAG systems and agents, with test suites, LLM-as-judge evals and a free cloud tier.

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Introduction

Opik is Comet’s open-source AI observability and evaluation platform. The repository comet-ml/opik is Apache-2.0 licensed, and the description reads: debug, evaluate and monitor LLM applications, RAG systems and agentic workflows with tracing, automated evaluations and production dashboards.

The official site says Opik logs every step an agent takes, from user interactions to context retrieval and tool calls, with automated eval workflows. It describes itself as true open source: the core observability and evaluation features are in the source code, and hosted versions share the same codebase.

Features

  1. Agent tracing: Log every step, including retrieval and tool calls.
  2. Test suites and assertions: Included in open source and every plan.
  3. LLM-as-judge: Automated evaluation workflows.
  4. Agent playground: Experiment with prompts and agents.
  5. Prompt management: Version and compare prompts.
  6. Agent optimizer and cost intelligence: Listed products for tuning and spend analysis, including auditing MCP installs and model selection.
  7. Self-host or cloud: Run the open-source build or use Comet’s cloud.

Pros

  1. Apache-2.0: Permissive, same code as hosted.
  2. Generous free cloud: Up to 10 members and 25k spans a month.
  3. Cheap Pro: $19 a month.
  4. Popular: About 23,000 GitHub stars at review.
  5. Compliance on Enterprise: SOC 2, ISO 27001, HIPAA and GDPR listed.

Cons

  1. Span limits: Free and Pro cap monthly spans.
  2. Self-hosting effort: Running it yourself means operating storage.
  3. Judge costs: LLM judges cost tokens.
  4. Broad Comet suite: Opik sits beside Comet’s MLOps products; navigation can confuse.
  5. Fast-moving: Frequent releases.

Sign up for the free cloud or self-host from GitHub, install the SDK (pip install opik), configure it, and decorate your functions to log traces. Then create a dataset and run an evaluation with built-in metrics. See Opik docs.

Resources:

Pricing

From Comet’s pricing page:

  1. Open source: $0, full feature set, run it your way.
  2. Free Cloud: $0. Up to 10 team members, 25k spans a month, 60-day retention.
  3. Pro Cloud: $19 a month. Up to 50 members, 100k spans, 60-day retention, customisable limits.
  4. Enterprise: Custom. SSO, flexible deployment, SLAs, compliance.
  1. Teams wanting open-source LLM observability with evals.
  2. Small teams that fit the free or $19 tier.
  3. Organisations needing self-hosting under a permissive licence.
  4. Not a fit if you only need a minimal eval library.

Conclusion

Opik is a permissively licensed, full-featured observability and evaluation platform with low-cost hosted tiers.

It is a strong default for teams that want to own their tracing data.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Opik side by side.