{"data":{"slug":"opik","name":"Opik","tagline":"Apache-2.0 LLM and agent tracing, evaluation and monitoring by Comet","category":"agents","categoryName":"AI Agents","url":"https://www.comet.com/docs/opik/","github":"https://github.com/comet-ml/opik","pricing":"open-source","hook":"Opik is an open-source platform for tracing, evaluating and monitoring LLM apps and agents: wrap a function with @track and you get full trace trees of LLM and tool calls, then datasets, experiments and LLM-as-a-judge metrics on top.","whatsGood":"Apache-2.0 (comet-ml/opik), release 2.2.103 (2026-10-16). The full platform is free to self-host, backend included, via ./opik.sh with Docker Compose for local use or Kubernetes for scale. It covers trace annotation, a prompt playground, hallucination and RAG metrics, online evaluation rules on production traffic, a PyTest integration for evals in CI, and an MCP server. ★~22.7k.","theCatch":"Self-hosting is a multi-service stack, not a single binary, so budget ops time or use Opik Cloud, Comet's hosted version with its own free tier and paid plans. README and docs links lean toward Comet sign-up. It overlaps heavily with Langfuse and Phoenix, so pick one tracing backend per project.","verdict":"A strong self-hostable Langfuse alternative with evals built in — choose it if CI evaluation matters most to you.","addedAt":"2026-10-18","featured":false,"domain":"AI Agents","subSpecialty":"Agents","subcategory":"Evals & Tracing","tags":["self-host","permissive","evals","observability","active"],"capabilities":[],"surfaces":["Self-host"],"ecosystem":["Multi-platform"],"licenseModel":"Apache-2.0","githubStars":22728,"starsPerWeek":126,"access":"free","archived":false,"repo":{"createdAt":"2023-05-10","pushedAt":"2026-10-19","license":"Apache-2.0","archived":false,"checkedAt":"2026-10-19"}},"related":[{"slug":"claude-code","name":"Claude Code","tagline":"Terminal-first coding agent with deep repository context"},{"slug":"cursor","name":"Cursor","tagline":"The AI-first code editor that understands your codebase"},{"slug":"devin","name":"Devin","tagline":"Autonomous AI engineer for defined engineering tasks"},{"slug":"stagehand","name":"Stagehand","tagline":"AI-native browser automation that mixes code and natural language"},{"slug":"browser-use","name":"Browser Use","tagline":"Open-source framework for LLM-driven browser agents"}],"links":{"self":"/api/gems/opik","html":"/gems/opik","markdown":"/gems/opik.md","category":"/api/gems?category=agents","categoryPage":"/stacks/agents"}}