C1 Artifacts API

C1 by Thesys is the essential API middleware for developers and AI-native teams ready to move beyond static text responses. It solves the critical challenge of low user engagement and poor workflow efficiency inherent in text-only LLM outputs. By transforming raw large language model (LLM) responses into live, adaptive, and fully interactive user interfaces, C1 enables you to build sophisticated software agents, copilots, and tools that deliver dynamic, task-specific UIs in real time.

Key Features

C1 is engineered to integrate seamlessly into your existing AI stack, providing the crucial Generative UI layer necessary for production-ready, engaging applications.

⚡️ Real-Time Generative UI Streaming

Instead of waiting for a complete text block or code snippet, C1 streams production-ready UI components progressively as the LLM generates them. This Real-time UI Streaming significantly enhances perceived application speed and user experience. Leveraging the C1 API and React SDK, the model’s intent is instantly translated into visible, interactive elements like charts, forms, and clickable buttons.

🌐 Universal LLM and Ecosystem Compatibility

C1 acts as an OpenAI-compatible endpoint, ensuring hassle-free integration into any language, framework, or cloud environment. It works out-of-the-box with all leading LLMs, including models from OpenAI (like GPT-5) and Anthropic (like Claude Sonnet 4). This flexibility allows your team to use the best model for the task without vendor lock-in.

🔗 Robust Tool-Call and Data Connection

C1 fully supports all tool-call mechanisms, allowing your LLM agent to connect to real-world data sources. The generated UI is populated by results pulled directly from your databases, external APIs, and documents. This capability ensures that the interactive charts, tables, and forms C1 generates are always accurate, relevant, and based on real-time organizational data.

🎨 Extensible Custom Component Support

Maintain complete control over your frontend experience. C1 allows you to bring your own React components with custom logic, styling, and interactions. You can fully customize the generated UI to match your brand using the themeable capabilities, including seamless dark mode support, ensuring every AI-driven interface is both powerful and visually consistent.

🛡️ Built-in Production Reliability Features

C1 is designed for enterprise scale. It includes Robust Error Handling that detects and fixes incomplete or invalid LLM responses in real time. Furthermore, it internally retries requests or routes to fallback providers if underlying LLM APIs experience downtime, ensuring maximum uptime and reliability for critical user workflows.

Use Cases

C1 by Thesys transforms conceptual AI intent into concrete, actionable interfaces across various domains, accelerating time-to-market for complex AI applications.

1. Dynamic Data Visualization and Internal Tools

Move beyond simple text summaries of metrics. For queries like "Show me monthly revenue trends for Q3" or "List all users who signed up in the last 30 days," C1 generates interactive tables with live line charts and tooltips. This allows internal teams to interact directly with the data visualization driven by natural language, making dashboards and internal tools significantly more dynamic and insightful.

2. Personalized E-commerce and Retail Flows

Enhance the shopping experience by generating rich, personalized shopping UIs in response to user queries. If a user asks a 24/7 support bot to "Add this specific model of running shoe to my cart and proceed to checkout," C1 instantly generates the interactive checkout form, complete with product displays and confirmation buttons, streamlining the transition from conversation to conversion.

3. Multi-Step Conversational Agents and Workflows

Replace frustrating, text-based back-and-forth with structured forms. For complex tasks like "Book me a flight from New York to London and confirm details," C1 generates a multi-step, interactive form directly within the chat interface. The form captures necessary details (dates, times, preferences) and handles validation, ensuring the agent collects all required information accurately and efficiently.

Conclusion

C1 by Thesys transforms the passive LLM experience into an active, productive one. It is the essential middleware for teams ready to move beyond text and build truly engaging, enterprise-grade AI applications that deliver value through dynamic, interactive interfaces.

Explore the C1 API and Playground today to see how easily you can ship sophisticated AI experiences without the traditional frontend overhead.