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.
from openrouter.components import ImageGenerationRequestOutputFormat# Open enum: unrecognized values are captured as UnrecognizedStrvalue: ImageGenerationRequestOutputFormat = "png"