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black-forest-labs/flux-1.1-pro

Faster, better FLUX Pro. Text-to-image model with excellent image quality, prompt adherence, and output diversity.

Capabilities

1:1 4:3 3:4 16:9 9:16 2:3 3:2 Reference Images Seed

Cost

$0.040 / image

Input Parameters

prompt required string

Text prompt for image generation

aspect_ratio string

Aspect ratio for the generated image

Default: "1:1"
custom 1:1 16:9 3:2 2:3 4:5 5:4 9:16 3:4 4:3
height integer

Height of the generated image in text-to-image mode. Only used when aspect_ratio=custom. Must be a multiple of 32 (if it's not, it will be rounded to nearest multiple of 32). Note: Ignored in img2img and inpainting modes.

min: 256, max: 1440
image_prompt string

Image to use with Flux Redux. This is used together with the text prompt to guide the generation towards the composition of the image_prompt. Must be jpeg, png, gif, or webp.

output_format string

Format of the output images.

Default: "webp"
webp jpg png
output_quality integer

Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs

Default: 80 min: 0, max: 100
prompt_upsampling boolean

Automatically modify the prompt for more creative generation

Default: false
safety_tolerance integer

Safety tolerance, 1 is most strict and 6 is most permissive

Default: 2 min: 1, max: 6
seed integer

Random seed. Set for reproducible generation

width integer

Width of the generated image in text-to-image mode. Only used when aspect_ratio=custom. Must be a multiple of 32 (if it's not, it will be rounded to nearest multiple of 32). Note: Ignored in img2img and inpainting modes.

min: 256, max: 1440
Version: 609793a667ed Updated: 2/26/2026 67.6M runs