PXI
Agent built into Arize Phoenix that investigates failing traces and proposes root causes, edits and tests playground prompts as diffs the user approves, and queries a Phoenix instance on request; it runs on the user's own model provider key and is in beta.
What it does
- Evaluation and observability
Sources
- Pricing
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Read the PXI page and its advanced page: neither states a price or quota. "PXI runs on your model provider and your API key."
- Description
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Official documentation · 18 Oct 2026
"The AI engineering agent built into Phoenix. Hand it an investigation instead of running it yourself."
- What it does
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Official documentation · 18 Oct 2026
"Investigates failures": "walks failing traces and proposes root causes".
- Sold within
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Official documentation · 18 Oct 2026
"The AI engineering agent built into Phoenix."
- Name
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Official documentation · 18 Oct 2026
"PXI" (pronounced "pixie", short for "Phoenix Intelligence").
- URL
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Official documentation · 18 Oct 2026
The product's own docs page, titled "PXI".
- Deployment
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Official documentation · 18 Oct 2026
"queries your Phoenix instance"; the page navigation lists "Self-Hosting" beside the hosted product.
- Interfaces
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Official documentation · 18 Oct 2026
"The same server-side agent in your terminal, shipped with the Phoenix CLI."
Also from Arize AI
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Arize AX Platform
AI observability platform that traces, evaluates and monitors machine-learning and LLM applications in production, surfacing issues and root causes.
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Arize Phoenix Developer tool
Open-source platform for tracing, evaluating and experimenting with LLM and agent applications, run locally, via Docker/Kubernetes, or as free Phoenix Cloud instances.
-
Arize Database (adb) Infrastructure service
An AI-native datastore (built on Apache Iceberg) that unifies observability and evaluation data in open formats for zero-copy access across the AI/data stack.
-
Alyx AI agent
AI engineering agent built into Arize AX that reads a project's traces, prompts, datasets and evals and acts on them — investigating issues, improving prompts and running evaluations from a full-page or side-chat surface whose context carries across pages.
-
Signal AI agent
Signal groups recurring failure patterns into issues and writes an investigation for each one.
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