OpenAI ChatGPT Web Stack Uses React 19 and Radix UI
July 15, 2026
OpenAI's web architecture leverages React 19, Tailwind CSS, and Radix UI to scale to over one billion users. The stack specifically optimizes for fast time to first paint for unauthenticated visitors.
HOW THIS AFFECTS YOU
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builderYou can model high-scale frontend performance by adopting these specific framework versions.
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designerYou can leverage Radix for accessible, unstyled primitive components in complex interfaces.