Whether to include usage metadata in streaming output.
If True, a final empty-content chunk carrying usage_metadata is emitted
during the stream. Set to False if the upstream model/proxy rejects
stream_options, or pass stream_options explicitly via model_kwargs or
a runtime kwarg to override.
langchain-fireworks 1.2.0Streaming now opts into stream_options.include_usage by default, and
the final empty-choices chunk is surfaced as an AIMessageChunk with
usage_metadata instead of being silently dropped.