# Arize AI

> Arize AI builds the observability layer for AI - a platform engineers use to trace, evaluate, and debug models, agents, and LLMs running in production. Its open-source Phoenix library and enterprise platform are used by companies like Uber, DoorDash, Instacart, Reddit, Booking.com, and Duolingo to make AI systems work in the real world.

- **Founded:** 2020
- **Headquarters:** Berkeley, California, United States
- **Founders:** Jason Lopatecki (Co-founder & CEO), Aparna Dhinakaran (Co-founder & CPO)
- **Team size:** approximately 120
- **Products:** Arize AX, Phoenix, OpenInference, Arize Copilot
- **Notable:** Raised largest-ever AI observability round at $70M Series C (Feb 2025), Phoenix passed 2 million monthly downloads, Processes over 1 trillion spans and 50M+ evaluations monthly

## Products & services

- **Arize AX** — Enterprise AI observability and evaluation platform for monitoring LLMs, agents and ML models in production.
- **Phoenix** — Open-source LLM tracing, evaluation and experimentation library. 2M+ monthly downloads, 9k+ GitHub stars.
- **OpenInference** — Open standard for AI tracing instrumentation, built on OpenTelemetry.
- **Arize Copilot** — AI assistant inside the platform that helps developers diagnose model and agent issues.

## Achievements

- Raised largest-ever AI observability round at $70M Series C (Feb 2025)
- Phoenix passed 2 million monthly downloads
- Processes over 1 trillion spans and 50M+ evaluations monthly
- Co-author of OpenInference, an OpenTelemetry-based standard for AI tracing
- Named to multiple Forbes AI 50 and enterprise AI leader lists

## Latest updates

- **2025-02** — Closed $70M Series C led by Adams Street Partners, with Datadog, PagerDuty and M12 joining.
- **2025-02** — TechCrunch coverage frames Arize as the first-mover in AI observability.
- **2024** — Phoenix crosses 2M monthly downloads; OpenInference standard gains broader adoption.

## Links

- Website: https://arize.com
- LinkedIn: https://www.linkedin.com/company/arizeai
- Twitter/X: https://twitter.com/arizeai
- GitHub: https://github.com/Arize-ai/phoenix
- YouTube: https://www.youtube.com/@arizeai
- Facebook: https://facebook.com/arizeai/

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Profile page: https://yespress.io/arize-ai
Published by YesPress — https://yespress.io
Last updated: 2026-05-30