RadixArk

RadixArk is a Palo Alto-based AI infrastructure startup that commercializes the open-source SGLang inference engine and the Miles reinforcement learning training framework, enabling large-scale, production-grade AI serving and post-training. Founded in 2025 by former xAI and NVIDIA engineers, it raised $100M in seed funding and supports deployments across hundreds of thousands of GPUs for customers including Google, Microsoft, and NVIDIA.