OpenAI Responses — Event Reference

This page documents the named SSE events emitted by POST /api/openai/v1/responses when stream: true.

Event types and order (typical)

response.created
response.in_progress
response.output_item.added
response.content_part.added
response.output_text.delta
response.function_call_arguments.delta
response.function_call_arguments.done
response.output_text.done
response.content_part.done
response.output_item.done
response.requires_action OR response.completed

Terminal signals that may also appear:

response.incomplete
response.failed

See also

OpenAI Chat events Anthropic events