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
Cost
$0.040 / image
Input Parameters
| Name | Type | Description | Default | Constraints |
|---|---|---|---|---|
prompt * | string | Text prompt for image generation | — | — |
aspect_ratio | string | Aspect ratio for the generated image | "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 (uri) | 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. | "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 | 80 | min: 0, max: 100 |
prompt_upsampling | boolean | Automatically modify the prompt for more creative generation | false | — |
safety_tolerance | integer | Safety tolerance, 1 is most strict and 6 is most permissive | 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 |
prompt required string Text prompt for image generation
aspect_ratio string Aspect ratio for the generated image
"1:1" 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.
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.
"webp" 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
80 min: 0, max: 100 prompt_upsampling boolean Automatically modify the prompt for more creative generation
false safety_tolerance integer Safety tolerance, 1 is most strict and 6 is most permissive
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.
609793a667ed Updated: 2/26/2026 67.6M runs
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