black-forest-labs/flux-kontext-max

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A premium text-based image editing model that delivers maximum performance and improved typography generation for transforming images through natural language prompts

Capabilities

Reference Images Seed

Cost

Community model (estimated from hardware time)

Input Parameters

Name	Type	Description	Default	Constraints
`prompt` *	string	Text description of what you want to generate, or the instruction on how to edit the given image.	`—`	—
`aspect_ratio`	string	Aspect ratio of the generated image. Use 'match_input_image' to match the aspect ratio of the input image.	`"match_input_image"`	match_input_image 1:1 16:9 9:16 4:3 3:4 3:2 2:3 4:5 5:4 21:9 9:21 2:1 1:2
`input_image`	string (uri)	Image to use as reference. Must be jpeg, png, gif, or webp.	`—`	—
`output_format`	string	Output format for the generated image	`"png"`	jpg png
`prompt_upsampling`	boolean	Automatic prompt improvement	`false`	—
`safety_tolerance`	integer	Safety tolerance, 0 is most strict and 6 is most permissive. 2 is currently the maximum allowed when input images are used.	`2`	min: 0, max: 6
`seed`	integer	Random seed. Set for reproducible generation	`—`	—

prompt required string

Text description of what you want to generate, or the instruction on how to edit the given image.

aspect_ratio string

Aspect ratio of the generated image. Use 'match_input_image' to match the aspect ratio of the input image.

Default: "match_input_image"

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

input_image string

Image to use as reference. Must be jpeg, png, gif, or webp.

output_format string

Output format for the generated image

Default: "png"

jpg png

prompt_upsampling boolean

Automatic prompt improvement

Default: false

safety_tolerance integer

Safety tolerance, 0 is most strict and 6 is most permissive. 2 is currently the maximum allowed when input images are used.

Default: 2 min: 0, max: 6

seed integer

Random seed. Set for reproducible generation

Version: 8389ed8e4b16 Updated: 2/26/2026 9.8M runs