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Encoding of the returned image bytes. Most models produce raster formats (png, jpeg, webp). SVG is supported by vectorization models (e.g. Quiver) — the SVG markup is UTF-8 base64-encoded in b64_json. GIF produces an animation on models that support it (OpenAI gpt-image-2.6; see frame_count).

Example Usage

Values

This is an open enum. Unrecognized values will not fail type checks.
  • "png"
  • "jpeg"
  • "webp"
  • "svg"
  • "gif"