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docs: improve output_version description (#31977)

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Mason Daugherty 2025-07-16 12:29:07 -04:00 committed by GitHub
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8
libs/core/langchain_core/language_models/chat_models.py
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@ -311,14 +311,16 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
does not properly support streaming.
"""
output_version: str = "v0"
output_version: Literal["v0", "v1"] = "v0"
"""Version of AIMessage output format to use.
This field is used to roll-out new output formats for chat model AIMessages
in a backwards-compatible way.
All chat models currently support the default of ``"v0"``. Chat model subclasses
can override with (customizable) supported values.
``'v1'`` standardizes output format using a list of typed ContentBlock dicts. We
recommend this for new applications.
All chat models currently support the default of ``"v0"``.
.. versionadded:: 0.3.68
"""