# RadixArk

> RadixArk is an AI infrastructure company spun out of the team behind SGLang, the open-source inference engine that serves trillions of tokens a day for the likes of Google, Microsoft, NVIDIA, Oracle and xAI. Founded by Ying Sheng and Banghua Zhu, RadixArk keeps SGLang and its reinforcement-learning framework Miles free and open while selling managed hosting and tooling on top, aiming to make building, training and running frontier models at least 10x cheaper and 10x more accessible. It launched publicly in May 2026 with a $100M seed round led by Accel and Spark Capital at a $400M valuation.

- **Founded:** 2026
- **Headquarters:** Stanford, California, United States
- **Founders:** Ying Sheng (Co-Founder & CEO), Banghua Zhu (Co-Founder)
- **Team size:** ~27 employees
- **Products:** SGLang, Miles, Managed Infrastructure & Tooling
- **Notable:** SGLang adopted across hundreds of thousands of GPUs generating trillions of tokens daily, Powers inference for Google, Microsoft, NVIDIA, Oracle, AMD, Nebius, LinkedIn and xAI, Raised $100M seed at a $400M post-money valuation - one of the largest AI infrastructure seed rounds

## Products & services

- **SGLang** — Open-source inference engine for serving modern LLMs and VLMs at scale. Runs on hundreds of thousands of GPUs and generates trillions of tokens daily for Google, Microsoft, NVIDIA, Oracle, AMD, Nebius, LinkedIn, xAI and Thinking Machines Lab. Free and open for all developers.
- **Miles** — Open-source reinforcement learning framework for large-scale LLM and VLM post-training, forked from and co-evolving with slime. Lets teams train models to improve over time.
- **Managed Infrastructure & Tooling** — Commercial managed hosting and tooling built on SGLang and Miles - the revenue engine that lets developers, startups, enterprises and research labs build and operate advanced AI systems with more speed, control and performance.

## Achievements

- SGLang adopted across hundreds of thousands of GPUs generating trillions of tokens daily
- Powers inference for Google, Microsoft, NVIDIA, Oracle, AMD, Nebius, LinkedIn and xAI
- Raised $100M seed at a $400M post-money valuation - one of the largest AI infrastructure seed rounds
- Attracted strategic investment from three chipmakers (NVIDIA, AMD, MediaTek) simultaneously
- Grew from an academic research project into commercial infrastructure without abandoning its open-source license

## Latest updates

- **2026-05** — RadixArk publicly launched with $100M seed funding led by Accel and co-led by Spark Capital at a $400M valuation.
- **2026-01** — News broke that Project SGLang was spinning out as RadixArk at a $400M valuation amid an inference-market boom.

## Links

- Website: https://radixark.ai
- LinkedIn: https://www.linkedin.com/company/radixark
- Twitter/X: https://x.com/radixark
- GitHub: https://github.com/radixark

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Profile page: https://yespress.io/radixark
Published by YesPress — https://yespress.io
Last updated: 2026-07-03