Observability

Opik (by Comet)

Open-source LLM observability and evaluation platform with a developer-first UI.

Overview

Opik provides full-stack tracing, dataset management, and evaluation workflows for LLM applications. It integrates seamlessly with LangChain, LlamaIndex, and OpenAI, offering a self-hostable or cloud-hosted experience focused on reproducibility and version control.

Best for

Self-hosted LLM app debugging
Reproducible eval pipelines

Trade-offs

vs Langfuse

Opik excels at self-hosted data control and tight Comet ML integration; Langfuse offers more out-of-the-box cloud polish and collaborative prompt playground features.

What XeroHack pre-wires

When you pick Opik (by Comet) in the interview, the engine emits these files into your scaffold:

opik.init(api_key='...')
OpenTelemetry exporter to Opik

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