Thesys

Thesys offers C1, a Generative UI API that augments LLMs to respond with interactive UI in real-time instead of text. It helps developers build dynamic, real-time UIs for AI products 10x faster.

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At a glance

Pricing

Freemium · Paid · Usage-based · Enterprise

Free tier

Yes

API

Yes

Skill level

Technical

About

What is Thesys?

Thesys provides C1, a Generative UI API designed as frontend infrastructure for AI products. This API middleware augments Large Language Models (LLMs) to respond with interactive user interfaces in real-time, rather than just plain text. C1 by Thesys allows developers to build dynamic, adaptive UIs for AI applications like assistants, copilots, and canvases, significantly reducing frontend overhead. It integrates in two steps, is compatible with any AI stack, including OpenAI and Anthropic models, and supports custom components and tool calls. The platform emphasizes enterprise-grade security, reliability, and compliance, offering zero data retention, GDPR, SOC2, and ISO27001 compliance. Teams using C1 can build AI frontends up to 10x faster and 80% cheaper, leading to more engaging user experiences compared to text-only responses.

Best used for

Ideal for developers who need to build dynamic and interactive user interfaces for AI applications, integrate LLM responses with live UIs, and accelerate frontend development for AI products. Especially valuable for teams creating agents, copilots, or other AI-powered tools where static UIs fall short.

Common actions

generate UI components

integrate AI with frontend

build dynamic interfaces

accelerate AI development

code assistant

Capabilities

Key features

Generative UI API
Real-time interactive UI
LLM API middleware
React SDK integration
Custom component support
OpenAI-compatible endpoint
Enterprise-grade security

Target Audience

developer

Integrations

openaianthropicn8n

Pricing & Plans

Freemium · Paid · Usage-based · Enterprise

Free Trial

FAQs

What is C1 by Thesys and how does it differ from traditional LLM responses?

C1 by Thesys is an LLM API that transforms large language model responses into live, adaptive user interfaces in real-time. Unlike traditional completion endpoints that return plain text, C1 outputs structured UI components like forms, tables, and charts, which can be rendered directly using its React SDK.

Can C1 by Thesys be used with any LLM or custom UI components?

Yes, C1 works out of the box with leading LLMs including OpenAI and Anthropic models, with more continuously being added. It also allows users to bring their own React components and customize the UI to match their company's design system, as it's built on Crayon's UI library.

What are the pricing options for C1 API and Artifacts API?

The C1 API offers a free tier with 5K calls/month, a 'Build' plan at $49/month for 25K calls, and a 'Grow' plan at $499/month for 500K calls. Enterprise plans are custom. The Artifacts API, for generating slides and reports, is billed separately, offering 100 free pages/month and $0.01 per page operation thereafter.

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