The unique ID of the server event.
The ID of the user message item that will be created.
Optionalprevious_The ID of the preceding item after which the new item will be inserted. Can be
null if the item has no predecessor.
The event type, must be input_audio_buffer.committed.
Returned when an input audio buffer is committed, either by the client or automatically in server VAD mode. The
item_idproperty is the ID of the user message item that will be created, thus aconversation.item.createdevent will also be sent to the client.