API Changelog

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New Features

• Citations and Source Links - C1 can now include citations and links to the original sources for the facts and data it presents. This adds credibility to the data and allows the user to verify the information.
  
  
• Enhanced Interactivity
  • Action Column for Tables - C1 can now generate a dedicated action column in tables, with buttons and actions that are specific to each row. This makes it easier than ever for users to act on data directly where they see it, from viewing details to deleting an entry.
    
  • Expanded Support for Actions - C1 can now attach continue conversation, custom actions and open_url actions to Icon Buttons and List Items. This provides more design flexibility to place actions in more intuitive, contextual locations within your UI.
    
  • Carousel Footer for Actions - Carousel items can now have a footer for action buttons. The buttons are aligned across the bottom of the carousel item.
    
  • ‘Explore’ Button - C1 can now add an optional “explore” button next to choices in checkboxes, radio groups, and switches. This allows a user to click for more information about a specific option, perfect for complex forms or when choices require more explanation.
    
    Not included by default, but can be added by using the c1_included_components metadata.
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      const runToolResponse = openAIClient.chat.completions.runTools({
        // ... other options
        metadata: {
          thesys: JSON.stringify({
            c1_included_components: ["ExploreButton"],
          }),
        },
      });
    

• New Chart Type: Donut Chart - We have added Donut Chart to the library of charts in C1. This is a variant of the Pie Chart that is displayed as a donut shape.
  
• New: Condensed Charts - Perfect for dashboards and tight spaces, C1 can now generate condensed versions of Bar, Area, and Line charts. These minimalist charts are designed to convey trends and data at a glance without taking up too much screen real estate.
  
• Smarter Icon Generation : We’ve significantly improved our icon generation logic to be more reliable. This fix completely eliminates cases of missing icons in the UI.

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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 the 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.

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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.
  

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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

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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.
  
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  Ask AI

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

  See all 5 lines

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Bug Fixes / Improvements

• Improved carousel responsiveness to adjust for different screen sizes.

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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.
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  Ask AI

  const runToolResponse = openAIClient.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.

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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