Arize AI (Phoenix)
Arize AI provides an AI observability and evaluation platform centered on Arize AX (the commercial product) and Phoenix (open-source LLM tracing and evaluation). Phoenix runs LLM-as-a-judge evaluators across traces, supports datasets and experiments, and integrates with OpenTelemetry. Arize AX layers monitoring, drift detection, and root-cause analysis on top of model and LLM telemetry.