Arize Phoenix

What is Arize Phoenix?

Arize Phoenix is an open-source tool for AI observability and evaluation. It helps developers and data scientists inspect traces, manage and evaluate prompts, curate datasets, and run experiments for their LLM applications.

Arize Phoenix's Core Features?

• Trace Inspection: Deeply analyze the execution flow of your LLM applications.
• Prompt Management: Organize, version, and evaluate different prompts.
• Dataset Curation: Build and manage high-quality datasets for evaluation and fine-tuning.
• Experiment Tracking: Log and compare different experiment runs.
• Integrations: Works with popular tools like LangChain, LlamaIndex, OpenAI, and Anthropic.

How to use Arize Phoenix?

Integrate the Phoenix library into your Python application to start logging traces and data. You can then visualize and analyze them in the Phoenix UI, which can be run locally.

Arize Phoenix's Use Cases?

1. Debugging complex LLM agent behaviors.
2. Evaluating the performance of different prompts and models.
3. Building robust evaluation datasets for RAG (Retrieval-Augmented Generation) systems.
4. Monitoring the performance of LLM applications in production.

FAQ from Arize Phoenix?

• Is Phoenix open-source?

Yes, Arize Phoenix is an open-source project available on GitHub.

• Can I use it with my existing LLM stack?

Yes, Phoenix is designed to integrate with popular libraries like LangChain, LlamaIndex, and frameworks from OpenAI, Anthropic, etc.

• How is it different from Arize's enterprise platform?

Phoenix is a lightweight, open-source tool focused on local development and evaluation, while the Arize enterprise platform provides a more comprehensive, production-grade observability solution.

Phoenix is an open-source AI observability platform designed for experimentation, evaluation, and troubleshooting. It provides:

• Tracing - Trace your LLM application's runtime using OpenTelemetry-based instrumentation.
• Evaluation - Leverage LLMs to benchmark your application's performance using response and retrieval evals.
• Datasets - Create versioned datasets of examples for experimentation, evaluation, and fine-tuning.
• Experiments - Track and evaluate changes to prompts, LLMs, and retrieval.
• Playground- Optimize prompts, compare models, adjust parameters, and replay traced LLM calls.
• Prompt Management- Manage and test prompt changes systematically using version control, tagging, and experimentation.

Phoenix is vendor and language agnostic with out-of-the-box support for popular frameworks (🦙LlamaIndex, 🦜⛓LangChain, Haystack, 🧩DSPy, 🤗smolagents) and LLM providers (OpenAI, Bedrock, MistralAI, VertexAI, LiteLLM, Google GenAI and more). For details on auto-instrumentation, check out the OpenInference project.

Phoenix runs practically anywhere, including your local machine, a Jupyter notebook, a containerized deployment, or in the cloud.

Installation

Install Phoenix via pip or conda

pip install arize-phoenix

Phoenix container images are available via Docker Hub and can be deployed using Docker or Kubernetes.

Packages

The arize-phoenix package includes the entire Phoenix platfom. However if you have deployed the Phoenix platform, there are light-weight Python sub-packages and TypeScript packages that can be used in conjunction with the platfrom.

Subpackages

Package	Language	Description
arize-phoenix-otel	Python	Provides a lightweight wrapper around OpenTelemetry primitives with Phoenix-aware defaults
arize-phoenix-client	Python	Lightweight client for interacting with the Phoenix server via its OpenAPI REST interface
arize-phoenix-evals	Python	Tooling to evaluate LLM applications including RAG relevance, answer relevance, and more
@arizeai/phoenix-client	JavaScript	Client for the Arize Phoenix API
@arizeai/phoenix-mcp	JavaScript	MCP server implementation for Arize Phoenix providing unified interface to Phoenix's capabilities

Tracing Integrations

Phoenix is built on top of OpenTelemetry and is vendor, language, and framework agnostic. For details about tracing integrations and example applications, see the OpenInference project.

Python Integrations

Integration	Package	Version Badge
OpenAI	openinference-instrumentation-openai
OpenAI Agents	openinference-instrumentation-openai-agents
LlamaIndex	openinference-instrumentation-llama-index
DSPy	openinference-instrumentation-dspy
AWS Bedrock	openinference-instrumentation-bedrock
LangChain	openinference-instrumentation-langchain
MistralAI	openinference-instrumentation-mistralai
Google GenAI	openinference-instrumentation-google-genai
Google ADK	openinference-instrumentation-google-adk
Guardrails	openinference-instrumentation-guardrails
VertexAI	openinference-instrumentation-vertexai
CrewAI	openinference-instrumentation-crewai
Haystack	openinference-instrumentation-haystack
LiteLLM	openinference-instrumentation-litellm
Groq	openinference-instrumentation-groq
Instructor	openinference-instrumentation-instructor
Anthropic	openinference-instrumentation-anthropic
Smolagents	openinference-instrumentation-smolagents
Agno	openinference-instrumentation-agno
MCP	openinference-instrumentation-mcp
Pydantic AI	openinference-instrumentation-pydantic-ai
Autogen AgentChat	openinference-instrumentation-autogen-agentchat
Portkey	openinference-instrumentation-portkey

JavaScript Integrations

Integration	Package	Version Badge
OpenAI	@arizeai/openinference-instrumentation-openai
LangChain.js	@arizeai/openinference-instrumentation-langchain
Vercel AI SDK	@arizeai/openinference-vercel
BeeAI	@arizeai/openinference-instrumentation-beeai
Mastra	@arizeai/openinference-mastra

Platforms

Phoenix has native integrations with LangFlow, LiteLLM Proxy, and BeeAI.

Community

Join our community to connect with thousands of AI builders.

• 🌍 Join our Slack community.
• 📚 Read our documentation.
• 💡 Ask questions and provide feedback in the #phoenix-support channel.
• 🌟 Leave a star on our GitHub.
• 🐞 Report bugs with GitHub Issues.
• 𝕏 Follow us on 𝕏.
• 🗺️ Check out our roadmap to see where we're heading next.
• 🧑‍🏫 Deep dive into everything Agents and LLM Evaluations on Arize's Learning Hubs.

Breaking Changes

See the migration guide for a list of breaking changes.

Copyright, Patent, and License

Copyright 2025 Arize AI, Inc. All Rights Reserved.

Portions of this code are patent protected by one or more U.S. Patents. See the IP_NOTICE.

This software is licensed under the terms of the Elastic License 2.0 (ELv2). See LICENSE.