API Changelog

​

New Features

• Custom Actions - We now allow C1 users to define custom actions that can be triggered from the C1 UI. For more details and examples, refer to Custom Actions.
• New Components - We have added following new components:
  • Single stacked bar chart - A horizontal bar chart that represents a whole divided into proportional segments. Each segment (or “slice”) corresponds to a specific category and visually depicts its percentage contribution to the total.
  
  • Scatter chart - A chart that plots data points to show the relationship between two variables. It helps identify trends, correlations, and outliers in the data.
  
• Redesigned Component - We have redesigned the Carousel, Table and Slider components to be more responsive and user-friendly.

​

New Features

• Bring Your Own Components - We now allow C1 users to provide their own custom React components for generation as a part of the C1 API and GenUI SDK. For more details and examples, refer to Custom Components.
• New Stable Models - With v-20250915 we are introducing GPT-5 as a stable offering. Older model strings for GPT-5 experimental (c1-exp/openai/gpt-5/<version>) will no longer be maintained, and all new features and bug fixes will now be released for the stable versions.
• Foldable Sections - We updated our sections to now allow foldable sections. The C1 API decides whether to use foldable sections or not at runtime based on the content and length of the section.
  
• Inline Headers - Components now have an optional inline header, allowing for more context to be given with the response.
  

​

Bug Fixes / Improvements

• Form inputs are now disabled until the assistant response is fully generated.
• Improved component usage of c1/anthropic/claude-sonnet-4/v-20250915 and c1/openai/gpt-5/v-20250915
• Improved internal error handling of the C1 API

​

New Features

• Editable Table - Added support for an inline multi edit component that allows changing multiple records at once. Not included by default, but can be added by using the c1_included_components metadata.
  
  Copy

  Ask AI

  const runToolResponse = openAIClient?.beta.chat.completions.runTools({
    // ... other options
    metadata: {
      thesys: JSON.stringify({
        c1_included_components: ["EditableTable"],
      }),
    },
  });
  

  See all 8 lines
• Improved List - We refined the list component by removing unclear interactive behavior, improving visual clarity, and adding support for multiple types: images, icons, and numbers.
  
• Improved Callout - We updated the callout visually to feel more contextual and natural specifically within conversation-based interfaces, improving clarity and highlighting key information more effectively.
  
• Form validations - Generated forms can optionally have validation rules applied to them.
  
• Improved Error Handling - SDK now allows passing an onError prop to the C1Component to handle errors.
  Copy

  Ask AI

  import { C1Component } from "@thesysai/genui-sdk";
  ...
  <C1Component onError={({code: number, c1Response: string}) => {
    console.error(`Generated UI error: ${code}, ${c1Response}`);
  }} />
  

  See all 5 lines

​

Bug Fixes / Improvements

• Improved carousel responsiveness to adjust for different screen sizes.

​

UI

• Added support for advance layouting options
  
• Added new mini-card component
  
• Advanced layouting options can be disabled by using metadata. Pass c1_excluded_components in the metadata to exclude the component. This might be useful if you are building a copilot or width-constrained agent.
  Copy

  Ask AI

  const runToolResponse = openAIClient?.beta.chat.completions.runTools({
    // ... other options
    metadata: {
      thesys: JSON.stringify({
        c1_excluded_components: ["Layout"],
      }),
    },
  });
  

• Added optional description for switch, radio and checkbox components - this is helpful for explaining each option to the user before they make a choice.

​

Bug Fixes / Improvements

• Fixed a bug where carousels appeared visually cluttered.

• Added new ‘Section’ and ‘Horizontal Stacked Bar Chart’ components
• Updated graph schema to significantly reduce token usage
• Various fixes:
  • Improved KaTeX rendering in markdown
  • Fixed chart issues with negative and very large numbers
  • Corrected Y-axis label display in charts
  • Fixed datepicker value saving and submission