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Arize Phoenix

by Arize AI

Open-source AI observability for evaluating, troubleshooting, and fine-tuning LLM applications

Open SourceOpen source (Elastic License 2.0), Arize Cloud for managed hosting APIOpen Source web api
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About Arize Phoenix

Phoenix by Arize is an open-source tool for AI observability, providing tracing, evaluation, and experimentation for LLM apps. It visualizes traces, evaluates output quality, detects hallucinations, and supports fine-tuning data preparation. Phoenix works as a local notebook tool or deployed server.

Key Features

  • LLM tracing
  • Evaluation framework
  • Hallucination detection
  • Embedding visualization
  • Fine-tuning data prep
  • Notebook integration
  • OpenTelemetry support

Pros

  • Strong open source
  • Good visualization
  • Hallucination detection
  • Works locally

Cons

  • Smaller community
  • Enterprise features need Arize Cloud
  • Documentation improving

Tags

ai-observabilityevaluationopen-sourcetracingfine-tuning