C1 by Thesys is a generative UI API that uses large language models to generate user interfaces on the fly. Credit: Shutterstock AI software builder Thesys has introduced C1 by Thesys, which the company describes as a generative UI API that uses large language models (LLMs) to generate user interfaces on the fly.Unveiled April 18, C1 by Thesys is available for general use. C1 lets developers turn LLM outputs into dynamic, intelligent interfaces in real time, Thesys said. In elaborating on the C1 technology, Thesys said enterprises now are racing to adopt AI, but building the front end for AI agents has remained a major hurdle. Teams spend months and significant resources designing and coding interfaces, only to deliver static, inconsistent, and often-disengaging user experiences, the company said. Generative UI enables LLMs to generate interactive interfaces in real time, Thesys said. Generative UI interprets natural language prompts, generates contextually relevant UI components, and adapts dynamically based on user interaction or state changes. C1 can generate UI for any use case and any data, enables UI generations to be guided via system prompts, supports integration with external tools via function calling, and supports a wide variety of UI components via its Crayon React framework, according to Thesys. More than 300 teams already are using Thesys tools to design and deploy adaptive AI interfaces, according to the company.