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RadixArk develops infrastructure software for building and running artificial intelligence systems.
RadixArk develops AI infrastructure, including SGLang, an open engine for serving AI models, and Miles, a framework for reinforcement learning post-training. Its tools are intended for developers, companies, and research institutions. Founded in 2025 by Ying Sheng and Banghua Zhu, it is based in Palo Alto, US. In May 2026, it raised USD 100 million in Seed funding co-led by Accel and Spark Capital, with Nventures, Salience Capital Partners Management, A&E Investment, HOF Capital, Walden Catalyst, AMD Ventures, LDV Management, W.T.T. Investment, MediaTek Ventures, and Databricks Ventures participating.
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