C1 by Thesys is a Generative UI API that augments LLMs to respond with interactive UI like charts, forms, cards, and more in real-time, instead of plain text. It integrates seamlessly with any LLM, framework, or MCP in just 2 lines of code. Ship rich, interactive AI apps 10x faster with 80% less UI overhead.
This is the 5th launch from Thesys. View more
OpenUI
Launched this week
The Open Standard for Generative UIMake your AI apps respond with interactive UI components like cards, tables, forms and charts instead of text. Streaming-native, token-efficient, and works with any AI model (GPT,Claude,M2.5) and agent framework like ai-sdk, Google ADK .
Free
Launch Team / Built With
Thesys
Really proud of what we shipped here.
For a year we watched the same three problems surface across 10,000+ developers building AI-generated interfaces: slow rendering, broken output, hard-to-integrate designs. We kept patching. The problems kept coming back.
Turns out they were all symptoms of the same root cause: the format we were using didn't fit how LLMs think.
So we built one that did. The results were immediate. 3x faster, 67% fewer tokens, dramatically more reliable.
Open source and free. Hope it helps.
AutonomyAI
That is so cool! LLM visuals tend to be really frustrating. super curious to see how you resolved this. Shared with our marketing team :)
Copus
An open standard for generative UI is exactly what the ecosystem needs. Having 10K+ developers already using this through Thesys gives it real momentum. Congrats on the launch!
Thesys
@handuo thanks for the support!
Kiara Translation
great idea!
Thesys
@ishiid thank you. excited to see what you build.
Kiara Translation
@zahle_khan wow - I will prepare it to show you
One good update, here! Congrats on the launch, @pgd!
Thesys
@pgd @neilverma thanks for the support
Trangram
creative domain name