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Arize Phoenix
Open-source LLM tracing, evaluation, and troubleshooting for AI apps and agents
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About Arize Phoenix
Phoenix is Arize AI's open-source observability tool for LLM applications, built on OpenTelemetry.
What it does
- Trace LLM calls, retrieval steps, and agent tool use
- Run LLM-as-judge and code-based evaluations on traces and datasets
- Prompt playground and experiment tracking
- Instrumentation for common frameworks (LangChain, LlamaIndex, OpenAI SDK, and more)
Runs locally, in a notebook, or self-hosted; Arize offers a managed platform for larger teams.
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