2026-07-08 08:57:50 +00:00

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# ArenaHard
## Overview
ArenaHard is a challenging benchmark that evaluates language models through competitive pairwise comparison. Models are judged against a GPT-4 baseline on difficult tasks requiring reasoning, understanding, and generation capabilities.
## Task Description
- **Task Type**: Competitive Model Evaluation (Arena-style)
- **Input**: Challenging instruction/question
- **Output**: Model response compared against GPT-4-0314 baseline
- **Scoring**: Elo-based rating from pairwise battles
## Key Features
- 500 challenging user prompts
- Two-game battle system (A vs B and B vs A)
- Elo rating calculation for model ranking
- Tests reasoning, instruction-following, and generation
- High correlation with Chatbot Arena rankings
## Evaluation Notes
- Default configuration uses **0-shot** evaluation
- Uses LLM judge (default: gpt-4-1106-preview)
- Baseline model: gpt-4-0314 outputs
- Reports win rate and Elo-based scores
- Note: Style-controlled win rate not currently supported
## Properties
| Property | Value |
|----------|-------|
| **Benchmark Name** | `arena_hard` |
| **Dataset ID** | [AI-ModelScope/arena-hard-auto-v0.1](https://modelscope.cn/datasets/AI-ModelScope/arena-hard-auto-v0.1/summary) |
| **Paper** | N/A |
| **Tags** | `Arena`, `InstructionFollowing` |
| **Metrics** | `winrate` |
| **Default Shots** | 0-shot |
| **Evaluation Split** | `test` |
| **Aggregation** | `elo` |
## Data Statistics
| Metric | Value |
|--------|-------|
| Total Samples | 500 |
| Prompt Length (Mean) | 406.36 chars |
| Prompt Length (Min/Max) | 29 / 9140 chars |
## Sample Example
**Subset**: `default`
```json
{
"input": [
{
"id": "088243c7",
"content": "Use ABC notation to write a melody in the style of a folk tune."
}
],
"target": "X:1\nT:Untitled Folk Tune\nM:4/4\nL:1/8\nK:G\n|:G2A2|B2A2|G2E2|D4|E2F2|G2F2|E2C2|B,4|\nA2B2|c2B2|A2F2|E4|D2E2|F2E2|D2B,2|C4:|",
"id": 0,
"group_id": 0,
"metadata": {
"capability": "ABC Sequence Puzzles & Groups"
}
}
```
## Prompt Template
**Prompt Template:**
```text
{question}
```
## Usage
### Using CLI
```bash
evalscope eval \
--model YOUR_MODEL \
--api-url OPENAI_API_COMPAT_URL \
--api-key EMPTY_TOKEN \
--datasets arena_hard \
--limit 10 # Remove this line for formal evaluation
```
### Using Python
```python
from evalscope import run_task
from evalscope.config import TaskConfig
task_cfg = TaskConfig(
model='YOUR_MODEL',
api_url='OPENAI_API_COMPAT_URL',
api_key='EMPTY_TOKEN',
datasets=['arena_hard'],
limit=10, # Remove this line for formal evaluation
)
run_task(task_cfg=task_cfg)
```