# Flux Flux, a subsidiary project of Black Forest Labs, is represented in our API by the following models:
ModelGenerated image properties
flux-pro
Format: JPG, PNG
Min size: 256x256
Max size: 1440x1440
Default size: 1024x768
For both height and width, the value must be a multiple of 32.
flux-pro/v1.1Format: JPG, PNG
Min size: 256x256
Max size: 1440x1440
Default size: 1024x768
For both height and width, the value must be a multiple of 32.
flux-pro/v1.1-ultraFormat: JPG, PNG
Fixed size: 2752x1536
flux-realismFormat: JPG, PNG
Min size: 512x512
Max size: 1536x1536
Default size: 1024x768
For both height and width, the value must be a multiple of 32.
flux/schnellFormat: PNG
Min size: 64x64
Max size: 1536x1536
Default size: 1024x768
For both height and width, the value must be a multiple of 32.
flux/devFormat: PNG
Min size: 512x512
Max size: 1536x1536
Default size: 1024x768
For both height and width, the value must be a multiple of 32.
flux/dev/image-to-imageFormat: PNG
Fixed size: Matches the dimensions of the reference image.
flux/kontext-max/text-to-imageFormat: JPEG, PNG
Image size can't be set directly — only a preset aspect ratio can be chosen.
Default aspect ratio and size: 1:1, 1024x1024
flux/kontext-max/image-to-imageFormat: JPEG, PNG
Image size can't be set directly — only a preset aspect ratio can be chosen.
Default aspect ratio and size: 16:9, 1184x880 (well, not quite 16:9)
flux/kontext-pro/text-to-imageFormat: JPEG, PNG
Image size can't be set directly — only a preset aspect ratio can be chosen.
Default aspect ratio and size: 1:1, 1024x1024
flux/kontext-pro/image-to-imageFormat: JPEG, PNG
Image size can't be set directly — only a preset aspect ratio can be chosen.
Default aspect ratio and size: 16:9, 1184x880 (well, not quite 16:9)
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