FLUX 1.1 [pro] Ultra
FLUX 1.1 [pro] Ultra is a high-resolution image generation model from Black Forest Labs supporting outputs up to 4 megapixels.
Black Forest LabsHigh-resolution image generation up to 4MP
FLUX 1.1 [pro] Ultra is an image generation model developed by Black Forest Labs, released in November 2024. It is an extended variant of the FLUX 1.1 [pro] model, distinguished by its ability to generate images at resolutions up to 4 megapixels — significantly higher than the base pro tier. The model accepts a text prompt context window of up to 10,000 tokens and supports optional reference image input to guide generation.
The model includes a Raw Mode toggle, which is designed to produce images with a more natural, less processed aesthetic by reducing automatic style enhancements. Prompt upsampling is also available as an option, allowing the model to internally expand and refine a short prompt before generation. These controls make FLUX 1.1 [pro] Ultra suited for use cases that require large-format imagery, such as print production, detailed editorial illustration, or high-fidelity creative asset generation.
What FLUX 1.1 [pro] Ultra supports
High-Resolution Output
Generates images at resolutions up to 4 megapixels, enabling large-format and print-quality results from a single inference call.
Reference Image Input
Accepts an image URL as a reference input alongside a configurable strength parameter to influence the style or composition of the generated image.
Raw Mode
A toggle that instructs the model to produce images with a more naturalistic appearance by reducing automatic stylistic post-processing.
Prompt Upsampling
Optionally expands and enriches a short text prompt internally before generation, helping to produce more detailed and coherent outputs.
Custom Dimensions
Supports explicit width and height inputs so developers can target specific aspect ratios and pixel dimensions for each generated image.
Output Format Selection
Allows selection of the output file format (such as JPEG or PNG) to match downstream pipeline or delivery requirements.
Reproducible Seeds
Accepts a seed value to make generation deterministic, enabling exact reproduction of a previously generated image given the same prompt and settings.
Safety Tolerance Control
Exposes a numeric safety tolerance parameter that lets developers adjust the strictness of content filtering applied during generation.
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Get Started FreeCommon questions about FLUX 1.1 [pro] Ultra
What is the maximum resolution FLUX 1.1 [pro] Ultra can generate?
FLUX 1.1 [pro] Ultra supports image generation up to 4 megapixels, which is the defining feature that distinguishes it from the standard FLUX 1.1 [pro] tier.
What is the context window for text prompts?
The model supports a text prompt context window of up to 10,000 tokens, allowing for detailed and lengthy prompt descriptions.
Can I use a reference image to guide generation?
Yes. The model accepts an image URL as a reference input, and a separate numeric parameter lets you control how strongly the reference image influences the output.
What does Raw Mode do?
Raw Mode is a toggle that reduces automatic stylistic enhancements applied during generation, producing images with a more natural and less processed look.
Is pricing information available for this model?
Pricing is not published in the current metadata. You should check the MindStudio platform or Black Forest Labs directly for current pricing details.
When was FLUX 1.1 [pro] Ultra released?
FLUX 1.1 [pro] Ultra was released in November 2024 by Black Forest Labs.
Documentation & links
Parameters & options
Optional reference image to use as additional visual context for generation.
Strength of the image prompt influence on generation
Enhance the prompt automatically for better results.
Enable raw mode for more natural, authentic aesthetics.
Content moderation level. 0 is most strict, 6 is most permissive.
A specific value that is used to guide the 'randomness' of the generation.
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