# RunEvalConfig

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig)

Configuration for a run evaluation.

## Signature

```python
RunEvalConfig()
```

## Extends

- `BaseModel`

## Properties

- `evaluators`
- `custom_evaluators`
- `batch_evaluators`
- `reference_key`
- `prediction_key`
- `input_key`
- `eval_llm`
- `model_config`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/311675a517f51ec6c77454124293c58df517e952/libs/langchain/langchain_classic/smith/evaluation/config.py#L84)