Thesys is a company focused on generative UI technology, offering an API platform named C1 that can convert the textual responses of large language models into interactive UI components in real time.
The core function of the C1 API is to act as middleware deployed on top of large language models, dynamically turning an AI application's plain-text outputs into an interactive UI that includes charts, forms, and lists.
Thesys offers usage-based tiered pricing, including a free plan for individual developers and monthly subscriptions for teams and enterprises; costs depend on API call volume.
According to the site, C1 supports mainstream large language models such as OpenAI GPT and Anthropic Claude Sonnet as underlying models.
Thesys aims to help teams rapidly build AI-driven applications; its React SDK and API design reduce front-end integration complexity, but some development knowledge helps to customize and use it more effectively.
Ideal for AI applications requiring dynamic, personalized interfaces, such as AI assistants, intelligent dashboards, interactive search, and product development workflows that require rapid prototyping.
The Thesys website offers an online Playground where users can directly experience generative UI by entering prompts, for example generating travel recommendations or stock analysis interfaces.

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