Implementation:Lm sys FastChat Copilot Arena Tab

Knowledge Sources	Lm_sys_FastChat
Domains	Data_Processing, Model_Evaluation
Last Updated	2026-02-07 06:00 GMT

Overview

Builds a Gradio tab component that displays the Copilot Arena leaderboard within the FastChat monitoring interface.

Description

Copilot Arena Tab is a compact UI module that constructs a Gradio tab for presenting the Copilot Arena leaderboard. The Copilot Arena is a specialized arena variant focused on code completion and copilot-style model evaluations, distinct from the general-purpose chatbot arena. This module renders leaderboard data in a user-friendly tabular format within the broader FastChat monitoring dashboard.

The build_copilot_arena_tab function creates the Gradio UI components including the leaderboard table and any associated metadata displays. The process_copilot_arena_leaderboard function transforms raw leaderboard data into the format expected by the Gradio components, handling column formatting, sorting, and display logic.

This module is designed to be composed into the larger FastChat Gradio application alongside other monitoring tabs such as the main arena leaderboard and category-specific views. Its lightweight design (87 lines) reflects the focused scope of presenting a single specialized leaderboard.

Usage

Use this module when building or extending the FastChat monitoring Gradio application and you need to include a Copilot Arena leaderboard tab. It is called during application startup as part of the tab assembly process.

Code Reference

Source Location

• Repository: Lm_sys_FastChat
• File: fastchat/serve/monitor/copilot_arena.py
• Lines: 1-87

Signature

def build_copilot_arena_tab() -> gr.Tab:
    """Build and return a Gradio Tab component for the Copilot Arena leaderboard."""

def process_copilot_arena_leaderboard(leaderboard: dict) -> pd.DataFrame:
    """Process raw Copilot Arena leaderboard data into a display-ready DataFrame."""

Import

from fastchat.serve.monitor.copilot_arena import build_copilot_arena_tab

I/O Contract

Inputs

Name	Type	Required	Description
leaderboard	dict	Yes	Raw Copilot Arena leaderboard data containing model names, scores, and battle statistics (used by process_copilot_arena_leaderboard)

Outputs

Name	Type	Description
tab	gr.Tab	build_copilot_arena_tab returns a Gradio Tab component ready for inclusion in a Gradio Blocks application
leaderboard_df	pd.DataFrame	process_copilot_arena_leaderboard returns a formatted DataFrame suitable for display in a Gradio Dataframe component

Usage Examples

import gradio as gr
from fastchat.serve.monitor.copilot_arena import build_copilot_arena_tab

# Include the Copilot Arena tab in a Gradio application
with gr.Blocks() as demo:
    with gr.Tabs():
        # Other tabs...
        copilot_tab = build_copilot_arena_tab()

demo.launch()

Related Pages

• Principle:Lm_sys_FastChat_Arena_Battle_UI
• Implements: Principle:Lm_sys_FastChat_Arena_Battle_UI
• Lm_sys_FastChat_Monitor_Markdown - Markdown content generation for leaderboard UI
• Lm_sys_FastChat_Basic_Stats - Basic usage statistics powering leaderboard data