- V1.1 Ultra
- Redux
Endpoint:
POST https://fal.run/fal-ai/flux-pro/v1.1-ultra
Endpoint ID: fal-ai/flux-pro/v1.1-ultraTry it in the Playground
Run this model interactively with your own prompts.
Quick Start
Input Schema
string
required
The prompt to generate an image from.
integer
The same seed and the same prompt given to the same version of the model
will output the same image every time.
boolean
default:"false"
If
True, the media will be returned as a data URI and the output data won’t be available in the request history.integer
default:"1"
The number of images to generate. Default value:
1Range: 1 to 4OutputFormatEnum
default:"jpeg"
The format of the generated image. Default value:
"jpeg"Possible values: jpeg, pngSafetyToleranceEnum
default:"2"
The safety tolerance level for the generated image. 1 being the most strict and 5 being the most permissive. Default value:
"2"Possible values: 1, 2, 3, 4, 5, 6boolean
default:"false"
Whether to enhance the prompt for better results.
string
The image URL to generate an image from.
float
default:"0.1"
The strength of the image prompt, between 0 and 1. Default value:
0.1Range: 0 to 1Enum | string
default:"16:9"
The aspect ratio of the generated image. Default value:
16:9Possible values: 21:9, 16:9, 4:3, 3:2, 1:1, 2:3, 3:4, 9:16, 9:21boolean
default:"false"
Generate less processed, more natural-looking images.
Output Schema
list<registry__image__fast_sdxl__models__Image>
required
The generated image files info.
Timings
required
integer
required
Seed of the generated Image. It will be the same value of the one passed in the
input or the randomly generated that was used in case none was passed.
list<boolean>
required
Whether the generated images contain NSFW concepts.
string
required
The prompt used for generating the image.
Input Example
Output Example
Performance
At $0.06 per image with 4-megapixel output capability, FLUX1.1 [pro] ultra positions between standard-resolution alternatives and premium high-res solutions.Professional-Grade Resolution Without Compromise
FLUX1.1 [pro] ultra extends Black Forest Labs’ architecture to 4-megapixel generation while maintaining the prompt interpretation and photorealism that defined the standard version. Where most high-resolution models sacrifice inference speed or introduce quality degradation, ultra mode processes at comparable latency to standard-resolution alternatives. What this means for you:- True 2K output: Generate up to 2048×2048 images without upscaling artifacts or post-processing, delivering print-ready assets directly from the API
-
Optional image conditioning: Use
image_urlandimage_prompt_strength(0-1 range) to guide generation with reference images, enabling style transfer and composition control - Flexible aspect ratios: Support for multiple aspect ratios with automatic megapixel-based billing, pay only for the resolution you actually use
-
Granular safety controls: Six-level
safety_toleranceparameter (1-6) lets you calibrate content filtering for your specific use case, from strict (1) to permissive (6)
Technical Specifications
API Documentation | Quickstart Guide | Enterprise Pricing
How It Stacks Up
**FLUX1.1 [pro] (0.06 vs $0.05 (20% premium). Standard FLUX1.1 [pro] remains ideal for high-volume workflows where 1-megapixel output meets requirements and cost per image is the primary constraint. FLUX.1 Kontext [pro] ($0.05) – FLUX1.1 [pro] ultra prioritizes maximum resolution and photorealism for single-image generation. FLUX.1 Kontext [pro] emphasizes multi-image context understanding (up to 5 reference images) at standard resolution, optimized for workflows requiring consistent style or character preservation across generations. **AuraFlow (0.06 vs $0.012). AuraFlow offers open-weight flexibility and cost efficiency for rapid iteration workflows where resolution and photorealism requirements are secondary to generation volume.Related
- FLUX1.1 [pro] — Image Generation
- FLUX.1 [pro] Fill — Image Generation
- FLUX1.1 [pro] Redux — Image Generation
- FLUX1.1 [pro] ultra Redux — Image Generation
- FLUX1.1 [pro] ultra Fine-tuned — Image Generation
- FLUX.1 [pro] Fill Fine-tuned — Image Generation
- FLUX1.1 [pro] ultra — Image Generation
Limitations
num_imagesrange: 1 to 4output_formatrestricted to:jpeg,pngsafety_tolerancerestricted to:1,2,3,4,5,6image_prompt_strengthrange: 0 to 1