black-forest-labs/flux-2-flex

Max-quality image generation and editing with support for ten reference images

Capabilities

1:14:33:416:99:162:33:2Reference ImagesSeed

Cost

Community model (estimated from hardware time)

Input Parameters

Name	Type	Description	Default	Constraints
`prompt`*	string	Text prompt for image generation	`—`	—
`aspect_ratio`	string	Aspect ratio for the generated image. Use 'match_input_image' to match the first input image's aspect ratio.	`"1:1"`	match_input_imagecustom1:116:93:22:34:55:49:163:44:3
`guidance`	number	Guidance scale for generation. Controls how closely the output follows the prompt	`4.5`	min: 1.5, max: 10
`height`	integer	Height of the generated image. Only used when aspect_ratio=custom. Must be a multiple of 16 (if it's not, it will be rounded to nearest multiple of 16).	`—`	min: 256, max: 2048
`input_images`	array	List of input images for image-to-image generation. Maximum 10 images. Must be jpeg, png, gif, or webp.		—
`output_format`	string	Format of the output images.	`"webp"`	webpjpgpng
`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	`true`	—
`resolution`	string	Resolution in megapixels. Up to 4 MP is possible, but 2 MP or below is recommended. The maximum image size is 2048x2048, which means that high-resolution images may not respect the resolution if aspect ratio is not 1:1. Resolution is not used when aspect_ratio is 'custom'. When aspect_ratio is 'match_input_image', use 'match_input_image' to match the input image's resolution (clamped to 0.5-4 MP).	`"1 MP"`	match_input_image0.5 MP1 MP2 MP4 MP
`safety_tolerance`	integer	Safety tolerance, 1 is most strict and 5 is most permissive	`2`	min: 1, max: 5
`seed`	integer	Random seed. Set for reproducible generation	`—`	—
`steps`	integer	Number of inference steps	`30`	min: 1, max: 50
`width`	integer	Width of the generated image. Only used when aspect_ratio=custom. Must be a multiple of 16 (if it's not, it will be rounded to nearest multiple of 16).	`—`	min: 256, max: 2048

promptrequiredstring

Text prompt for image generation

aspect_ratiostring

Aspect ratio for the generated image. Use 'match_input_image' to match the first input image's aspect ratio.

Default: "1:1"

match_input_imagecustom1:116:93:22:34:55:49:163:44:3

guidancenumber

Guidance scale for generation. Controls how closely the output follows the prompt

Default: 4.5min: 1.5, max: 10

heightinteger

Height of the generated image. Only used when aspect_ratio=custom. Must be a multiple of 16 (if it's not, it will be rounded to nearest multiple of 16).

min: 256, max: 2048

input_imagesarray

List of input images for image-to-image generation. Maximum 10 images. Must be jpeg, png, gif, or webp.

Default:

output_formatstring

Format of the output images.

Default: "webp"

webpjpgpng

output_qualityinteger

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

Default: 80min: 0, max: 100

prompt_upsamplingboolean

Automatically modify the prompt for more creative generation

Default: true

resolutionstring

Resolution in megapixels. Up to 4 MP is possible, but 2 MP or below is recommended. The maximum image size is 2048x2048, which means that high-resolution images may not respect the resolution if aspect ratio is not 1:1. Resolution is not used when aspect_ratio is 'custom'. When aspect_ratio is 'match_input_image', use 'match_input_image' to match the input image's resolution (clamped to 0.5-4 MP).

Default: "1 MP"

match_input_image0.5 MP1 MP2 MP4 MP

safety_toleranceinteger

Safety tolerance, 1 is most strict and 5 is most permissive

Default: 2min: 1, max: 5

seedinteger

Random seed. Set for reproducible generation

stepsinteger

Number of inference steps

Default: 30min: 1, max: 50

widthinteger

Width of the generated image. Only used when aspect_ratio=custom. Must be a multiple of 16 (if it's not, it will be rounded to nearest multiple of 16).

min: 256, max: 2048

Version: dbeea265fe7bUpdated: 7/25/2026303.1K runs