FLUX1.1 [pro] Ultra is Black Forest Labs's highest-resolution tier of the FLUX 1.1 Pro model. It adds raw image format support and expanded resolution capabilities for print, large-format, and photorealistic output use cases.
import { experimental_generateImage as generateImage } from 'ai';
const result = await generateImage({ model: 'bfl/flux-pro-1.1-ultra', prompt: 'A red balloon on a wooden table.'});FLUX1.1 [pro] Ultra is the highest tier of the FLUX 1.1 Pro model, available through AI Gateway since November 1, 2024 as part of the image-only model expansion. The "Ultra" designation adds raw image format support and expanded resolution capabilities beyond standard FLUX 1.1 Pro. Choose it when output quality and resolution are the primary constraints rather than generation speed or cost.
Raw image output is a meaningful differentiator for professional and post-production workflows. Unlike compressed formats such as JPEG or WebP, raw files preserve the full tonal range without lossy compression artifacts. That gives retouchers, photographers, and design teams more latitude for color grading, exposure adjustment, and compositing.
Within the FLUX family on AI Gateway, Ultra occupies the resolution and format quality ceiling of the FLUX.1 generation. If you need the highest quality from the FLUX.1 lineage (print collateral, large-format advertising, billboard assets, high-resolution stock imagery), Ultra provides the output dimensions and file format support that standard FLUX 1.1 Pro doesn't.