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Chat models

Features (natively supported)​

All ChatModels implement the Runnable interface, which comes with default implementations of all methods, ie. ainvoke, batch, abatch, stream, astream. This gives all ChatModels basic support for async, streaming and batch, which by default is implemented as below:

  • Async support defaults to calling the respective sync method in asyncio's default thread pool executor. This lets other async functions in your application make progress while the ChatModel is being executed, by moving this call to a background thread.
  • Streaming support defaults to returning an Iterator (or AsyncIterator in the case of async streaming) of a single value, the final result returned by the underlying ChatModel provider. This obviously doesn't give you token-by-token streaming, which requires native support from the ChatModel provider, but ensures your code that expects an iterator of tokens can work for any of our ChatModel integrations.
  • Batch support defaults to calling the underlying ChatModel in parallel for each input by making use of a thread pool executor (in the sync batch case) or asyncio.gather (in the async batch case). The concurrency can be controlled with the max_concurrency key in RunnableConfig.

Each ChatModel integration can optionally provide native implementations to truly enable async or streaming. The table shows, for each integration, which features have been implemented with native support.

ModelInvokeAsync invokeStreamAsync stream
AzureChatOpenAI✅✅✅✅
BedrockChat✅❌✅❌
ChatAnthropic✅✅✅✅
ChatAnyscale✅✅✅✅
ChatGooglePalm✅✅❌❌
ChatJavelinAIGateway✅✅❌❌
ChatKonko✅❌❌❌
ChatLiteLLM✅✅✅✅
ChatMLflowAIGateway✅❌❌❌
ChatOllama✅❌✅❌
ChatOpenAI✅✅✅✅
ChatVertexAI✅✅✅❌
ErnieBotChat✅❌❌❌
JinaChat✅✅✅✅
MiniMaxChat✅✅❌❌
PromptLayerChatOpenAI✅❌❌❌
QianfanChatEndpoint✅✅✅✅