Arize AI
Arize AI is an Observability and AI Monitoring company founded in 2020 and based in Berkeley, United States. It has raised $131M in total funding, most recently a Series C in 2025.
ML and LLM observability platform with OpenTelemetry-based tracing, real-time evaluations, and agent observability for multi-step AI agent traces in production. Strong OTEL integration; Arize AX supports agent observability; Phoenix is its open-source library for LLM tracing; the company raised a $70M Series C in February 2025 and acquired evaluation startup Velvet the following month.
Arize's OTEL-based approach aligns with the broader observability industry standard, making it a natural bridge between traditional APM and AI-specific monitoring for agent-driven applications.
arize.com ↗·Observability and AI Monitoring·
United States·private 
