Join waitlist
Back to products
Agent Builder by Thesys

Agent Builder by Thesys

Build AI agents that respond with UI instead of text

Website thesys.dev
Overview

What it is

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.

Intent

I need it when

Generate formatted reports and slides programmatically within AI applications

The Reports API enables AI apps to generate slides and reports as artifacts, billed separately at $0.01 per page operation after 100 free pages/month, without consuming LLM tokens, providing a dedicated channel for document generation.

Deploy AI infrastructure with enterprise-grade compliance and control

The Scale tier offers custom pricing with self-hosting or VPC deployment options, compliance/SLA guarantees, SSO/SAML support, and ability to bring own LLM keys, enabling enterprises to maintain data control and meet regulatory requirements.

Build AI applications that generate dynamic, interactive UIs beyond text responses

Agent Builder enables creation of AI apps that respond with dashboards, forms, charts, slides, and reports through the C1 Generative UI API, allowing developers to move beyond text-only outputs and create rich, real-time user interfaces.

Scale AI product infrastructure from prototype to production with flexible resource allocation

Thesys offers tiered pricing from free exploration (3K calls/month) through Build ($49/mo, 25K calls) and Grow ($499/mo, 500K calls) plans, enabling teams to start small and scale API call allowances as production workloads increase without infrastructure overhaul.

Integrate multiple LLM providers without vendor lock-in or markup costs

Agent Builder provides pay-as-you-go access to leading LLMs (Anthropic Claude, OpenAI GPT, Google Gemini) through OpenRouter at provider rates with zero markup, allowing teams to switch models and optimize costs independently.

Drop

Not a fit when

  • User needs a fully managed, no-code agent builder without API integration requirements
  • Organization requires on-premises deployment without custom enterprise options
  • User seeks a product with included LLM costs in base pricing rather than separate token billing
  • Team needs real-time collaboration features not mentioned in available documentation
  • User requires pre-built industry-specific agent templates rather than custom API-driven development
Commercials

Pricing

USD0 - USD499 / monthly View pricing