C1 by Thesys

API that makes LLMs respond with interactive UI components

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C1 is a Generative UI API that enables LLMs to respond with interactive UI elements like charts, forms, and cards in real time. It integrates with any LLM, framework, or MCP server using minimal code. It is designed for developers building AI-powered applications who want to reduce frontend UI overhead.

At a glance

Company
Thesys
Pricing
freemium
API available
Yes
Self-hostable
No
Launched
2025-09
Last verified
2026-05-11

Capabilities

real-time-streamingllm-integrationui-generationmcp-supportmulti-frameworklow-code-integration

Categories

developer-platformsagentscode

Alternatives

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