Tool
Opik
Comet’s open-source LLM evaluation and prompt library
About
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Opik logs every step your agent takes, from user interactions to context retrieval and tool calls — with automated eval workflows to find and fix errors across development, testing, and production.
Opik’s powerful open-source version, generous free tier, robust enterprise platform, and complete set of tools for agent tracing, debugging, LLM-as-a-judge evaluation, prompt management, and production monitoring make it one of the best AI observability platforms available in 2026 for individual developers and large organizations alike. Compare Opik to alternatives like LangSmith, Langfuse, Arize, Braintrust, Galileo, and more.
With end-to-end observability and evaluation tooling, Opik lets you confidently scale agents from prototype to production. Comprehensive logs, repeatable test cycles, and straightforward evaluation scores ensure consistent performance and help you build trust with end users and internal stakeholders alike.
Features
- Opik Platform Observability & Evals
- Cost Intelligence
- Agent Optimizer
- Opik User Stories
- Compare Platforms
- Deep Learning Weekly
- Pricing
- Open Source
- Pricing detail
- OSS + cloud free spans
- Platforms
- Web / Self-host
Alternatives from our catalog
Tools on the same shelves as Opik, ordered by shared tags and our own comparisons. Not vendor endorsements.
- promptfooOpen Source · CLI / CI
CI-native prompt testing used widely in LLM eng
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- LangfuseOpen Source · Web / Self-host
Self-host favorite for traces + prompt versions
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- AgentaOpen Source · Web / Self-host
OSS playground for comparing prompt variants
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- DSPyOpen Source · Python / CLI
Research-favorite automatic prompt optimization
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- BraintrustFreemium · Web + SDK
Eval-centric prompt shipping for serious LLM apps
same tags
- PromptBaseUsage-based · Web
Largest paid prompt marketplace for Midjourney/ChatGPT packs
same tags