FLUX1.1 [pro] ultra | [text-to-image]
Black Forest Labs' FLUX1.1 [pro] ultra delivers up to 2K resolution (4 megapixels) image generation at $0.06 per image. With 4x the resolution detail, this model extends FLUX1.1 [pro]'s capabilities with enhanced photorealism while maintaining ~10 second generation times. Built for production workflows where resolution and visual fidelity directly impact deliverables.
Use Cases: High-resolution marketing assets | Product photography | Editorial illustrations
At $0.06 per image with 4-megapixel output capability, FLUX1.1 [pro] ultra positions between standard-resolution alternatives and premium high-res solutions.
| Metric | Result | Context |
|---|
| Max Resolution | 4 megapixels (2048×2048) | 4x standard FLUX1.1 [pro] resolution |
| Inference Speed | ~10 seconds per sample | Ultra mode generation time from Black Forest Labs |
| Cost per Image | $0.06 | 16.7 images per $1.00 |
| Batch Generation | Up to 4 images | Parallel generation via num_images parameter |
| Related Endpoints | FLUX1.1 [pro], FLUX.1 Kontext [pro] | Standard resolution and context-aware variants |
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_url and image_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_tolerance parameter (1-6) lets you calibrate content filtering for your specific use case, from strict (1) to permissive (6)
Technical Specifications
| Spec | Details |
|---|
| Architecture | FLUX1.1 [pro] ultra |
| Input Formats | Text prompts, optional reference images via URL |
| Output Formats | JPEG, PNG |
| Max Resolution | 4 megapixels (up to 2048×2048) |
| License | Commercial use enabled via fal partnership |
API Documentation | Quickstart Guide | Enterprise Pricing
How It Stacks Up
FLUX1.1 [pro] ($0.05) – FLUX1.1 [pro] ultra trades cost efficiency for 4x resolution at $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 ($0.012) – FLUX1.1 [pro] ultra delivers professional-grade photorealism and 4-megapixel output at 5x the cost ($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.
fal-ai/flux-pro/v1.1-ultra