AiOpenAIChoiceDelta

The incremental part of one choice - what this chunk adds to the assistant message.

Name	Type	Description	Notes
role	String	Sent on the first chunk only, always assistant.	[optional] [enum: assistant]
content	String	The text this chunk appends. Null when the chunk carries no text.	[optional] [nullable]
tool_calls	List	The tool calls the model requested, emitted in place of text.	[optional]