Opik
Partial infoOpen-source LLM evaluation and tracing from Comet.
Opik is Comet's open-source platform for tracing, evaluating, and monitoring LLM apps, including a self-hostable server and managed cloud. It emphasizes evals and a scoring library.
License
Open source (Apache-2.0)
Deployment
Self-hosted, Managed
Pricing
Open-source; Comet-hosted cloud has free and paid tiers.
SDKs / languages
Python, TypeScript
Strengths
- Open-source and self-hostable
- Strong evaluation library
- Backed by Comet
Limitations
- Younger than some peers
- Some features tied to Comet cloud
Alternatives
Arize Phoenix
Open-source LLM tracing and evaluation, OpenTelemetry-native.
Braintrust
Eval-first platform for iterating on LLM quality.
Datadog LLM Observability
LLM tracing and monitoring inside the Datadog platform.
Helicone
Open-source LLM logging and monitoring via a proxy.
Langfuse
Open-source LLM observability, evals, and prompt management.
LangSmith
Tracing, evals, and prompt management from the LangChain team.
Facts verified 19 July 2026. Neutral summary, not an endorsement; verify current details with the vendor.