A
security

Arize Phoenix (AX)

Open-source LLM observability with production monitoring, evals, and tracing. Free self-hosted or managed cloud with usage-based pricing.
llm-observability tracing evaluation
Intermediate Level
Free (OSS) / $10 per million spans
Starting Price
Try Arize Phoenix (AX)
Category
security
Setup Time
< 2 minutes
security
Category
Intermediate
Difficulty
Active
Status
Web App
Type

What is Arize Phoenix (AX)?

Open-Source LLM Observability — Scale with Phoenix AX

Monitor, evaluate, and improve LLM applications from development to production. Phoenix captures traces, calculates quality metrics, and visualizes failure modes. Start free with open-source, scale with managed cloud. Supports OpenTelemetry, LangChain, LlamaIndex, and all major frameworks.

Key Capabilities

What makes Arize Phoenix (AX) powerful

LLM Tracing

Capture every LLM call, tool use, and retrieval with OpenTelemetry-compatible distributed tracing

Implementation Level Intermediate

Evals & Metrics

Calculate hallucination, toxicity, relevance, and custom metrics with LLM-as-judge evaluators

Implementation Level Intermediate

Production Monitoring

Track latency, cost, token usage, and error rates with real-time dashboards and alerts

Implementation Level Professional

Safety & PII

Detect PII leakage, unsafe outputs, and prompt injections with built-in guardrails

Implementation Level Professional

Professional Integration

These capabilities work together to provide a comprehensive AI solution that integrates seamlessly into professional workflows. Each feature is designed with enterprise-grade reliability and performance.

Pricing

Start using Arize Phoenix (AX) today

Free (OSS) / $10 per million spans

Starting price

Get Started

Quick Information

Category security
Pricing Model Freemium
Last Updated 11/17/2025

Tags

llm-observability tracing evaluation opentelemetry oss monitoring

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