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sidebar_position: 0
sidebar_class_name: hidden
keywords: [compatibility]
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# Chat models
[Chat models](/docs/concepts/#chat-models) are language models that use a sequence of [messages](/docs/concepts/#messages) as inputs and return messages as outputs (as opposed to using plain text). These are generally newer models.
:::info
If you'd like to write your own chat model, see [this how-to](/docs/how_to/custom_chat_model/).
If you'd like to contribute an integration, see [Contributing integrations](/docs/contributing/integrations/).
:::
## Featured Providers
:::info
While all these LangChain classes support the indicated advanced feature, you may have
to open the provider-specific documentation to learn which hosted models or backends support
the feature.
:::
import { CategoryTable, IndexTable } from "@theme/FeatureTables";
<CategoryTable category="chat" />
## All chat models
<IndexTable /> |