Is there a free plan?

Yes, the Free plan costs $0/month and includes 3K API calls per month with bring-your-own LLM key and Discord support.

How are LLM costs handled?

LLM tokens are billed separately at the provider's rates with no markup; select free models are also available with zero LLM cost, though data may be used for training.

Can Thesys be self-hosted?

Yes, the custom Scale plan offers self-hosting or VPC deployment along with custom rate limits, compliance and SLAs.

What does the Reports API cost?

It includes 100 pages free per month, then $0.01 per page operation, and does not consume LLM tokens.

Thesys

C1 by Thesys, is a Generative UI API that turns LLM text output into interactive UI in realtime.

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About Thesys

Thesys is a Generative UI company that builds OpenUI, which it describes as an open standard for Generative UI. Its hosted product, OpenUI Cloud, lets AI applications respond with interactive charts, cards, dashboards, forms, slides and reports instead of plain text. The pricing page refers to the API as C1 by Thesys.

Developers call the OpenUI Cloud API, and each response consumes API calls plus LLM tokens. Teams can bring their own LLM key or use models from Google, OpenAI and Anthropic at provider rates with no markup, with more models available via OpenRouter. A separate Reports API generates slides and reports and does not consume LLM tokens. The site lists an n8n integration, documentation, a GitHub presence and a Discord community.

Thesys targets teams building AI products that go beyond text, from individuals exploring the API to enterprises that need self-hosting or VPC deployment, SSO/SAML, compliance and SLAs.

Best for

Developers building AI chat or agent apps
Startups shipping their first AI features
Enterprises needing self-hosted generative UI
Teams generating AI-driven reports and slides

Pros

Free tier with 3K API calls per month
LLM tokens billed at provider rates with no markup
Self-hosting or VPC deployment on Scale plan
Zero data retention on all paid models

Cons

LLM tokens are billed separately from plan fees
Free models may use data for training
Reports API artifacts billed separately per page

Pricing

Free plan at $0/month (3K API calls), Build at $49/month (25K calls), Grow at $499/month (500K calls), and custom Scale pricing, with LLM tokens billed separately at provider rates and up to 20% off for annual billing.

Thesys FAQ

Is there a free plan?: Yes, the Free plan costs $0/month and includes 3K API calls per month with bring-your-own LLM key and Discord support.
How are LLM costs handled?: LLM tokens are billed separately at the provider's rates with no markup; select free models are also available with zero LLM cost, though data may be used for training.
Can Thesys be self-hosted?: Yes, the custom Scale plan offers self-hosting or VPC deployment along with custom rate limits, compliance and SLAs.
What does the Reports API cost?: It includes 100 pages free per month, then $0.01 per page operation, and does not consume LLM tokens.