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

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# τ-bench
## Overview
τ-bench (Tau Bench) is a benchmark for evaluating conversational AI agents that interact with users through domain-specific API tools and policy guidelines. It simulates dynamic, multi-turn conversations where a language model acts as both the user and the agent.
## Task Description
- **Task Type**: Conversational Agent Evaluation
- **Input**: User scenarios with specific goals and constraints
- **Output**: Agent actions via API tool calls to complete tasks
- **Domains**: Airline customer service, Retail customer service
## Key Features
- Dynamic conversation simulation with LLM-simulated users
- Domain-specific API tools and policy guidelines
- Realistic customer service scenarios
- Tests multi-turn dialogue capabilities
- Evaluates tool use and policy compliance
## Evaluation Notes
- **Installation Required**: `pip install git+https://github.com/sierra-research/tau-bench`
- **User Model Configuration**: Requires setting up a user simulation model
- Primary metric: **Accuracy** based on task completion reward
- Supports **airline** and **retail** domains
- Uses **pass@k** aggregation for robustness evaluation
- [Usage Example](https://evalscope.readthedocs.io/en/latest/third_party/tau_bench.html)
## Properties
| Property | Value |
|----------|-------|
| **Benchmark Name** | `tau_bench` |
| **Dataset ID** | [tau-bench](https://github.com/sierra-research/tau-bench) |
| **Paper** | N/A |
| **Tags** | `Agent`, `FunctionCalling`, `Reasoning` |
| **Metrics** | N/A |
| **Default Shots** | 0-shot |
| **Evaluation Split** | `test` |
| **Aggregation** | `mean_and_pass_hat_k` |
## Data Statistics
*Statistics not available.*
## Sample Example
*Sample example not available.*
## Prompt Template
*No prompt template defined.*
## Extra Parameters
| Parameter | Type | Default | Description |
|-----------|------|---------|-------------|
| `user_model` | `str` | `qwen-plus` | Model used to simulate the user in the environment. |
| `api_key` | `str` | `EMPTY` | API key for the user model backend. |
| `api_base` | `str` | `https://dashscope.aliyuncs.com/compatible-mode/v1` | Base URL for the user model API requests. |
| `generation_config` | `dict` | `{'temperature': 0.0}` | Default generation config for user model simulation. |
## Usage
### Using CLI
```bash
evalscope eval \
--model YOUR_MODEL \
--api-url OPENAI_API_COMPAT_URL \
--api-key EMPTY_TOKEN \
--datasets tau_bench \
--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=['tau_bench'],
dataset_args={
'tau_bench': {
# extra_params: {} # uses default extra parameters
}
},
limit=10, # Remove this line for formal evaluation
)
run_task(task_cfg=task_cfg)
```