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Context

A compound component system for displaying AI model context window usage, token consumption, and cost estimation.

The Context component provides a comprehensive view of AI model usage through a compound component system. It displays context window utilization, token consumption breakdown (input, output, reasoning, cache), and cost estimation in an interactive hover card interface.

Installation

npx ai-elements@latest add context

Usage

import {
  Context,
  ContextTrigger,
  ContextContent,
  ContextContentHeader,
  ContextContentBody,
  ContextContentFooter,
  ContextInputUsage,
  ContextOutputUsage,
  ContextReasoningUsage,
  ContextCacheUsage,
} from '@/components/ai-elements/context';

<Context maxTokens={128000} usedTokens={40000} modelId="openai:gpt-4">
  <ContextTrigger />
  <ContextContent>
    <ContextContentHeader />
    <ContextContentBody>
      <ContextInputUsage />
      <ContextOutputUsage />
      <ContextReasoningUsage />
      <ContextCacheUsage />
    </ContextContentBody>
    <ContextContentFooter />
  </ContextContent>
</Context>

Features

• Compound Component Architecture: Flexible composition of context display elements
• Visual Progress Indicator: Circular SVG progress ring showing context usage percentage
• Token Breakdown: Detailed view of input, output, reasoning, and cached tokens
• Cost Estimation: Real-time cost calculation using the tokenlens library
• Intelligent Formatting: Automatic token count formatting (K, M, B suffixes)
• Interactive Hover Card: Detailed information revealed on hover
• Context Provider Pattern: Clean data flow through React Context API
• TypeScript Support: Full type definitions for all components
• Accessible Design: Proper ARIA labels and semantic HTML
• Theme Integration: Uses currentColor for automatic theme adaptation

Props

<Context />

| Prop | Type | | maxTokens? | number | | usedTokens? | number | | usage? | LanguageModelUsage | | modelId? | ModelId | | ...props? | ComponentProps<HoverCard> |

<ContextTrigger />

| Prop | Type | | children? | React.ReactNode | | ...props? | ComponentProps<Button> |

<ContextContent />

| Prop | Type | | className? | string | | ...props? | ComponentProps<HoverCardContent> |

<ContextContentHeader />

| Prop | Type | | children? | React.ReactNode | | ...props? | ComponentProps<"div"> |

<ContextContentBody />

| Prop | Type | | children? | React.ReactNode | | ...props? | ComponentProps<"div"> |

<ContextContentFooter />

| Prop | Type | | children? | React.ReactNode | | ...props? | ComponentProps<"div"> |

Usage Components

All usage components (ContextInputUsage, ContextOutputUsage, ContextReasoningUsage, ContextCacheUsage) share the same props:

| Prop | Type | | children? | React.ReactNode | | className? | string | | ...props? | ComponentProps<"div"> |

Component Architecture

The Context component uses a compound component pattern with React Context for data sharing:

1. <Context> - Root provider component that holds all context data
2. <ContextTrigger> - Interactive trigger element (default: button with percentage)
3. <ContextContent> - Hover card content container
4. <ContextContentHeader> - Header section with progress visualization
5. <ContextContentBody> - Body section for usage breakdowns
6. <ContextContentFooter> - Footer section for total cost
7. Usage Components - Individual token usage displays (Input, Output, Reasoning, Cache)

Token Formatting

The component uses Intl.NumberFormat with compact notation for automatic formatting:

• Under 1,000: Shows exact count (e.g., "842")
• 1,000+: Shows with K suffix (e.g., "32K")
• 1,000,000+: Shows with M suffix (e.g., "1.5M")
• 1,000,000,000+: Shows with B suffix (e.g., "2.1B")

Cost Calculation

When a modelId is provided, the component automatically calculates costs using the tokenlens library:

• Input tokens: Cost based on model's input pricing
• Output tokens: Cost based on model's output pricing
• Reasoning tokens: Special pricing for reasoning-capable models
• Cached tokens: Reduced pricing for cached input tokens
• Total cost: Sum of all token type costs

Costs are formatted using Intl.NumberFormat with USD currency.

Styling

The component uses Tailwind CSS classes and follows your design system:

• Progress indicator uses currentColor for theme adaptation
• Hover card has customizable width and padding
• Footer has a secondary background for visual separation
• All text sizes use the text-xs class for consistency
• Muted foreground colors for secondary information

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