Implementation:Openai Openai python Response Image Gen Call Generating

Knowledge Sources	Openai_Openai_python OpenAI API Reference
Domains	API_Types, Responses_API
Last Updated	2026-02-15 00:00 GMT

Overview

Concrete streaming event type for signaling that image generation is actively producing an image provided by the openai-python SDK.

Description

ResponseImageGenCallGeneratingEvent is a Pydantic model emitted when an image generation tool call is actively generating an image (intermediate state). It carries the item_id identifying the image generation item, the output_index locating it within the response output array, and a sequence_number for event ordering. The type field is always "response.image_generation_call.generating".

Usage

Import this type when building streaming event handlers that need to track the intermediate generating state of an image generation call, for example to display a progress indicator to the user.

Code Reference

Source Location

• Repository: openai-python
• File: src/openai/types/responses/response_image_gen_call_generating_event.py

Signature

class ResponseImageGenCallGeneratingEvent(BaseModel):
    """Emitted when an image generation tool call is actively generating an image (intermediate state)."""

    item_id: str
    output_index: int
    sequence_number: int
    type: Literal["response.image_generation_call.generating"]

Import

from openai.types.responses import ResponseImageGenCallGeneratingEvent

I/O Contract

Fields

Name	Type	Required	Description
item_id	str	Yes	The unique identifier of the image generation item being processed.
output_index	int	Yes	The index of the output item in the response's output array.
sequence_number	int	Yes	The sequence number of the image generation item being processed.
type	Literal["response.image_generation_call.generating"]	Yes	The type of the event. Always response.image_generation_call.generating.

Usage Examples

import openai

client = openai.OpenAI()

stream = client.responses.create(
    model="gpt-4o",
    input="Generate an image of a sunset over mountains.",
    stream=True,
)

for event in stream:
    if event.type == "response.image_generation_call.generating":
        print(f"Image is being generated for item {event.item_id}...")

Related Pages

• Environment:Openai_Openai_python_Python_3_9_Plus