C1 by Thesys

C1 by Thesys

C1 by Thesys is an API middleware that transforms large language model (LLM) responses into live, adaptive user interfaces in real time, enabling developers to build dynamic AI-powered apps with interactive UI components like forms, charts, and tables.

C1 by Thesys is api software teams evaluate for developer tools. Use this page to review pricing, integration signals, and the best alternatives before you commit.

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Quick Overview

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What it does

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C1 by Thesys

C1 by Thesys is an API layer built on top of large language models (LLMs) that converts their text responses into structured, interactive UI components such as forms, tables, charts, and layouts. It uses a React SDK to render these live interfaces in real time, allowing developers to create intelligent, context-aware frontends for AI-powered applications without hardcoding UI for every possible user interaction. Supporting multiple LLM providers including OpenAI and Anthropic, C1 offers flexibility and customization to match company design systems, leveraging Crayon's UI library for theming and component support. It is designed for teams building AI-native software agents, copilots, and tools where dynamic, evolving interfaces are essential.

Make AI apps respond with interactive UI in real-time

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Key Features

Real-time Adaptive UI

Transforms LLM responses into live, interactive user interfaces that adapt dynamically to user input and context.

Multi-LLM Support

Works out of the box with leading LLMs including OpenAI and Anthropic, with ongoing additions for broader compatibility.

React SDK

Provides a React software development kit to render structured UI components directly in applications.

Customizable Design System

Built on Crayon's UI library, allowing customization of themes, tokens, and components to match company branding.

Structured UI Components

Outputs UI elements such as forms, tables, charts, cards, and layouts instead of plain text.

Fast and Secure

Designed for fast, secure, and real-time rendering of dynamic interfaces.

Pricing

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Use Cases

AI-Native Software Agents

Build intelligent agents that interact with users through dynamic, context-aware interfaces.

Copilots and Assistants

Create AI copilots that adapt their UI in real time based on user queries and state.

Dynamic Task-Specific Interfaces

Develop tools with interfaces that evolve quickly to meet changing user needs without static UI limitations.

Rapid Prototyping and Deployment

Accelerate time to market by generating live UI components directly from LLM outputs.

Integrations

OpenAI

Supports OpenAI models for generating LLM responses.

Anthropic

Supports Anthropic models for LLM responses.

Crayon UI Library

Enables UI customization and theming through Crayon's component library.

Benefits

Faster time to market by automating UI generation from LLM responses.
Lower development costs by reducing the need to hardcode UI for every scenario.
Higher user engagement through adaptive, context-aware interfaces.
Flexibility to work with multiple LLM providers without vendor lock-in.
Customizable UI that aligns with company branding and design systems.

Limitations

Pricing details are not publicly available from the provided information.
No explicit mention of offline or non-React frontend support.

Frequently Asked Questions

What does C1 by Thesys do?
C1 converts large language model responses into live, interactive user interfaces in real time, enabling dynamic AI-powered applications.
Which LLMs does C1 support?
C1 supports multiple leading LLMs including OpenAI and Anthropic, with plans to add more.
Can I customize the UI generated by C1?
Yes, C1 is built on Crayon's UI library, allowing you to customize themes, tokens, and components to match your design system.
Is C1 suitable for production applications?
Yes, C1 is designed for fast, secure, and real-time rendering of dynamic interfaces suitable for production use.

Getting Started

  1. 1 Step 1: Obtain an API key from Thesys and set up your environment variable THESYS_API_KEY.
  2. 2 Step 2: Use the provided OpenAI client with the Thesys base URL to make chat completion requests.
  3. 3 Step 3: Integrate the C1 React SDK in your frontend to render the structured UI components returned by the API.

Support

docs

Documentation and API usage examples are available on the Thesys website.

contact

Contact can be made via the Thesys contact page for support inquiries.

API

Available: Yes
Documentation:

API documentation and usage examples are available on the Thesys website and include usage of the OpenAI client with a custom base URL.

Rate Limits:

Rate limit information is not provided in the available content.

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