Indicates that the last attached image is a mask for inpainting (editing specific regions). The mask must match the dimensions of the base image, with transparent (zero-alpha) areas showing which parts to edit. Only takes effect when an image is attached.

Generation

OpenAI’s state-of-the-art image generation model as of April 21, 2026, designed for fast, high-quality image generation and editing with strong prompt adherence and flexible image sizes. It supports generating, editing, restyling, and combining images attached to the latest user query.

Optional Parameters:

Set aspect ratio, with options 3:2, 1:1, and 2:3.
Set quality to low, medium, and high.
Enable use mask by toggling it on or by typing use_mask in the prompt. This option is turned off by default.

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GPT-Image-2