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.
Thesys launches
Launch date
Agent Builder by Thesys Build AI agents that respond with UI instead of text
Launched on February 10th, 2026
C1 Artifacts API Build AI apps that can generate stunning slides and reports
Launched on November 11th, 2025
