# BaseMessageChunk

> **Class** in `langchain_core`

📖 [View in docs](https://reference.langchain.com/python/langchain-core/messages/base/BaseMessageChunk)

Message chunk, which can be concatenated with other Message chunks.

## Signature

```python
BaseMessageChunk(
    self,
    content: str | list[str | dict] | None = None,
    content_blocks: list[types.ContentBlock] | None = None,
    **kwargs: Any = {},
)
```

## Extends

- `BaseMessage`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/51e954877efd2d2c3c5bf09364dcfec8794eadb0/libs/core/langchain_core/messages/base.py#L409)