openai.internal.OaImagesRequest

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POST /v1/images/generations. prompt and model always ride; everything else is optional and omitted when the client left it unset.

• response_format (url | b64_json) is a dall-e-only parameter — the GPT image models always return base64 and reject the field, so the client omits it for them and defaults it to b64_json elsewhere (we need bytes, and the dall-e default is url).
• output_format / output_compression / background / moderation are GPT-image-only; style is dall-e-3-only. The client sends what it was given and lets the API reject impossible combinations, rather than encoding a model table that goes stale.

Source:<builtin>/openai/ns_internal/images.bamlbytes 1693–1988