# Criteria

> **Class** in `langchain_classic`

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

Configuration for a reference-free criteria evaluator.

## Signature

```python
Criteria()
```

## Extends

- `SingleKeyEvalConfig`

## Properties

- `criteria`
- `llm`
- `evaluator_type`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/ee95ad6907f5eab94644183393a20aa2a032bb19/libs/langchain/langchain_classic/smith/evaluation/config.py#L123)