gpt-image-2.5-all and gpt-image-2-all now support size.
An explicit size, such as 1024x1024, is the priority target. Omit it or pass auto to preserve native behavior; prompts can still describe dimensions and aspect ratios.
Common WxH targets with a long edge of 512–1536 pixels are supported, including dimensions that are not multiples of 16. A 1536 square may involve interpolation. 2K sizes are not currently listed as precisely supported; verify actual image dimensions for strict requirements.
See the size table and request example.
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