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Models & Pricing

C1 is family of API endpoints that use different underlying LLM models. The pricing is based on the model family and the amount of tokens used. Pricing is based on model name irrespective of the kind of endpoint you use. For example, using the embed endpoint with c1/anthropic/claude-sonnet-4/v-* is priced the same as using the visualize endpoint with the same model. Generally speaking, a model name is more than just the model of the LLM it uses. It also includes the version of the model, the set of components available for use in the UI, and any other metadata. This guide is called “Models” and not “API Versions” because typically you’d pass the API version to the model parameter in the request to the LLM compatible endpoints of C1.
  • Experimental models are for testing only and NOT recommended for production use.
  • Latest models are updated monthly with the latest stable version of the model.
  • Stable models are updated in the table below. When shipping in production, use the latest stable model.

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Model Versions & SDK Requirements

Use the full model string (including version) as shown below. Copy the complete string to use in your API requests.

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Embed Endpoint Models

Claude Sonnet 4

Model: c1/anthropic/claude-sonnet-4/v-20250930Install Dependencies:
npm install @thesysdev/genui-sdk@~0.7.3 @thesysdev/react-ui@~0.9.1 @thesysdev/react-core@~0.7.6

GPT-5

Model: c1/openai/gpt-5/v-20250930Install Dependencies:
npm install @thesysdev/genui-sdk@~0.7.3 @thesysdev/react-ui@~0.9.1 @thesysdev/react-core@~0.7.6

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Visualize Endpoint Models

Claude Sonnet 4

Model: c1/anthropic/claude-sonnet-4/v-20250915Install Dependencies:
npm install @thesysdev/genui-sdk@~0.7.3 @thesysdev/react-ui@~0.9.1 @thesysdev/react-core@~0.7.6

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Other Model Versions

C1 Model (Latest Version)genui-sdkreact-uireact-core
c1-exp/anthropic/claude-3.5-haiku/v-20250709~0.6.27~0.8.14~0.7.6
c1-exp/openai/gpt-4.1/v-20250617~0.6.27~0.8.14~0.7.6
C1 Model (Latest Version)genui-sdkreact-uireact-core
c1/anthropic/claude-3.5-sonnet/v-20250709~0.6.27~0.8.14~0.7.6
c1/anthropic/claude-3.7-sonnet/v-20250709~0.6.27~0.8.14~0.7.6
c1-latest———
c1-202504XX*———

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Model Specifications

These specifications apply to all versions of each model family.
C1 ModelLLMInput Price / M tokensCached Input (Read)Cached Input (Write)Output Price / M tokensContext WindowMax Output
c1/anthropic/claude-sonnet-4Sonnet 4$3.00$0.30$3.75$15.00200K64K
c1/openai/gpt-5GPT 5$1.25$0.125—$10.50400K128K
c1-exp/anthropic/claude-3.5-haiku3.5 Haiku$0.80$0.80$1.00$4.00200K8192
c1-exp/openai/gpt-4.1GPT 4.1$2.00$0.50—$8.001M32K