Arize Phoenix — open-source observability for LLMs with tracing, evaluation, and embedding analysis.
Five passes over the same idea, each from a different angle. Do them in order, or jump to whichever you need.
Phoenix (by Arize) is an open-source tool for LLM observability. Features: OpenTelemetry-based tracing, embedding drift detection, retrieval analysis for RAG, LLM evaluation, and a local notebook-friendly interface. Supports OpenAI, Anthropic, LangChain, and LlamaIndex integrations.
