Chat models
Chat models are language models that use a sequence of messages as inputs and return messages as outputs (as opposed to using plain text). These are generally newer models.
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If you'd like to write your own chat model, see this how-to. If you'd like to contribute an integration, see Contributing integrations.
Featured Providers
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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.