# ConversationSummaryBufferMemory

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory)

Buffer with summarizer for storing conversation memory.

Provides a running summary of the conversation together with the most recent
messages in the conversation under the constraint that the total number of
tokens in the conversation does not exceed a certain limit.

## Signature

```python
ConversationSummaryBufferMemory()
```

## Extends

- `BaseChatMemory`
- `SummarizerMixin`

## Properties

- `max_token_limit`
- `moving_summary_buffer`
- `memory_key`
- `buffer`
- `memory_variables`

## Methods

- [`abuffer()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/abuffer)
- [`load_memory_variables()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/load_memory_variables)
- [`aload_memory_variables()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/aload_memory_variables)
- [`validate_prompt_input_variables()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/validate_prompt_input_variables)
- [`save_context()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/save_context)
- [`asave_context()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/asave_context)
- [`prune()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/prune)
- [`aprune()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/aprune)
- [`clear()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/clear)
- [`aclear()`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/aclear)

## ⚠️ Deprecated

Deprecated since version 0.3.1.

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/9f232caa7a8fe1ca042a401942d5d90d54ceb1a6/libs/langchain/langchain_classic/memory/summary_buffer.py#L12)