# LLMSummarizationCheckerChain

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain)

Chain for question-answering with self-verification.

## Signature

```python
LLMSummarizationCheckerChain()
```

## Description

**Example:**

```python
from langchain_openai import OpenAI
from langchain_classic.chains import LLMSummarizationCheckerChain

model = OpenAI(temperature=0.0)
checker_chain = LLMSummarizationCheckerChain.from_llm(model)
```

## Extends

- `Chain`

## Properties

- `sequential_chain`
- `llm`
- `create_assertions_prompt`
- `check_assertions_prompt`
- `revised_summary_prompt`
- `are_all_true_prompt`
- `input_key`
- `output_key`
- `max_checks`
- `model_config`
- `input_keys`
- `output_keys`

## Methods

- [`from_llm()`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/from_llm)

## ⚠️ Deprecated

Deprecated since version 0.2.13.

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/fb6ab993a73180538f6cca876b3c85d46c08845f/libs/langchain/langchain_classic/chains/llm_summarization_checker/base.py#L71)