black-forest-labs/flux-1.1-pro-ultra

FLUX1.1 [pro] in ultra and raw modes. Images are up to 4 megapixels. Use raw mode for realism.

Capabilities

Reference Images Seed

Cost

$0.060 / 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"`	21:9 16:9 3:2 4:3 5:4 1:1 4:5 3:4 2:3 9:16 9:21
`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.	`—`	—
`image_prompt_strength`	number	Blend between the prompt and the image prompt.	`0.1`	min: 0, max: 1
`output_format`	string	Format of the output images.	`"jpg"`	jpg png
`raw`	boolean	Generate less processed, more natural-looking images	`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	`—`	—

prompt required string

Text prompt for image generation

aspect_ratio string

Aspect ratio for the generated image

Default: "1:1"

21:9 16:9 3:2 4:3 5:4 1:1 4:5 3:4 2:3 9:16 9:21

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.

image_prompt_strength number

Blend between the prompt and the image prompt.

Default: 0.1 min: 0, max: 1

output_format string

Format of the output images.

Default: "jpg"

jpg png

raw boolean

Generate less processed, more natural-looking images

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

Version: 5ea10f739af9 Updated: 2/26/2026 20.2M runs