Output aspect ratio; determined by model if not provided.
grok-imagine-1.0-edit supports: 1:1 (social media, avatars, thumbnails), 16:9 (landscape images, covers, desktop backgrounds), 9:16 (mobile portrait, short video covers, Stories), 3:2 (landscape photography), 2:3 (portrait photography, posters).
grok-imagine-image and grok-imagine-image-quality additionally support: 4:3 (presentations, traditional landscape), 3:4 (portraits, vertical design), 2:1 (horizontal banners, headers), 1:2 (vertical banners, long images), 19.5:9 (horizontal smartphone screens), 9:19.5 (vertical smartphone wallpapers), 20:9 (horizontal ultra-wide screens), 9:20 (vertical ultra-wide screens), auto (model automatically selects ratio based on prompt).