PRODUCTION SCENARIO
The Responses API requests get_order with call_id call_81. The application runs the lookup and needs to continue the conversation with its result.
Which input item returns the result to that call?
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Show answer and explanation
Answer: A function_call_output item carrying call_id call_81 and the lookup's result text
A function_call_output item is the vehicle for a tool result and it references the model's original call through call_id, so returning call_81 with the result closes that call. A freshly generated call_id correlates to nothing outstanding, a plain user message leaves the call unanswered so the model may repeat it, and a function_call item carries arguments the model chose rather than a result the application produced.
Official Source: https://developers.openai.com/api/docs/guides/function-calling ↗