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

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# AlpacaEval2.0
## Overview
AlpacaEval 2.0 is an evaluation framework for instruction-following language models that uses an LLM judge to compare model outputs against a strong baseline. It provides win-rate metrics reflecting human preferences.
## Task Description
- **Task Type**: Instruction-Following Evaluation (Pairwise Comparison)
- **Input**: User instruction/question
- **Output**: Model response compared against GPT-4 Turbo baseline
- **Metric**: Win rate against baseline model
## Key Features
- Auto-annotator for scalable evaluation
- Compares against GPT-4 Turbo baseline outputs
- High correlation with human preferences
- Cost-effective evaluation method
- Tests general instruction-following capabilities
## Evaluation Notes
- Default configuration uses **0-shot** evaluation
- Uses LLM judge (default: gpt-4-1106-preview)
- Baseline model: gpt-4-turbo outputs
- Reports win rate metric
- Note: Length-controlled win rate not currently supported
## Properties
| Property | Value |
|----------|-------|
| **Benchmark Name** | `alpaca_eval` |
| **Dataset ID** | [AI-ModelScope/alpaca_eval](https://modelscope.cn/datasets/AI-ModelScope/alpaca_eval/summary) |
| **Paper** | N/A |
| **Tags** | `Arena`, `InstructionFollowing` |
| **Metrics** | `winrate` |
| **Default Shots** | 0-shot |
| **Evaluation Split** | `eval` |
## Data Statistics
| Metric | Value |
|--------|-------|
| Total Samples | 805 |
| Prompt Length (Mean) | 164.92 chars |
| Prompt Length (Min/Max) | 12 / 1917 chars |
## Sample Example
**Subset**: `alpaca_eval_gpt4_baseline`
```json
{
"input": [
{
"id": "95236545",
"content": "What are the names of some famous actors that started their careers on Broadway?"
}
],
"target": "Several famous actors started their careers on Broadway before making it big in film and television. Here are a few notable examples:\n\n1. Sarah Jessica Parker - Before she was Carrie Bradshaw on \"Sex and the City,\" Sarah Jessica Parker was a ... [TRUNCATED] ... f the many performers who have transitioned from the Broadway stage to broader fame in the entertainment industry. Broadway often serves as a proving ground for talent, and many actors continue to return to the stage throughout their careers.",
"id": 0,
"group_id": 0,
"metadata": {
"generator": "gpt4_1106_preview",
"dataset": "helpful_base"
}
}
```
*Note: Some content was truncated for display.*
## 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 alpaca_eval \
--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=['alpaca_eval'],
limit=10, # Remove this line for formal evaluation
)
run_task(task_cfg=task_cfg)
```