# Flux

Flux, a subsidiary project of Black Forest Labs, is represented in our API by the following models:

<table><thead><tr><th width="250" valign="top">Model</th><th>Generated image properties</th></tr></thead><tbody><tr><td valign="top"><a href="flux/flux-pro">flux-pro</a><br></td><td>Format: <strong>JPG, PNG</strong><br>Min size: <strong>256</strong>x<strong>256</strong><br>Max size: <strong>1440</strong>x<strong>1440</strong><br>Default size: <strong>1024</strong>x<strong>768</strong><br>For both height and width, the value must be a multiple of 32.</td></tr><tr><td valign="top"><a href="flux/flux-pro">flux-pro/v1.1</a></td><td>Format: <strong>JPG, PNG</strong><br>Min size: <strong>256</strong>x<strong>256</strong><br>Max size: <strong>1440</strong>x<strong>1440</strong><br>Default size: <strong>1024</strong>x<strong>768</strong><br>For both height and width, the value must be a multiple of 32.</td></tr><tr><td valign="top"><a href="flux/flux-pro-v1.1-ultra">flux-pro/v1.1-ultra</a></td><td>Format: <strong>JPG, PNG</strong><br>Fixed size: <strong>2752</strong>x<strong>1536</strong></td></tr><tr><td valign="top"><a href="flux/flux-realism">flux-realism</a></td><td>Format: <strong>JPG, PNG</strong><br>Min size: <strong>512</strong>x<strong>512</strong><br>Max size: <strong>1536</strong>x<strong>1536</strong><br>Default size: <strong>1024</strong>x<strong>768</strong><br>For both height and width, the value must be a multiple of 32.</td></tr><tr><td valign="top"><a href="flux/flux-schnell">flux/schnell</a></td><td>Format: <strong>PNG</strong><br>Min size: <strong>64</strong>x<strong>64</strong><br>Max size: <strong>1536</strong>x<strong>1536</strong><br>Default size: <strong>1024</strong>x<strong>768</strong><br>For both height and width, the value must be a multiple of 32.</td></tr><tr><td valign="top"><a href="flux/flux-dev">flux/dev</a></td><td>Format: <strong>PNG</strong><br>Min size: <strong>512</strong>x<strong>512</strong><br>Max size: <strong>1536</strong>x<strong>1536</strong><br>Default size: <strong>1024</strong>x<strong>768</strong><br>For both height and width, the value must be a multiple of 32.</td></tr><tr><td valign="top"><a href="flux/flux-dev-image-to-image">flux/dev/image-to-image</a></td><td>Format: <strong>PNG</strong><br>Fixed size: Matches the dimensions of the reference image.</td></tr><tr><td valign="top"><a href="flux/flux-kontext-max-text-to-image">flux/kontext-max/text-to-image</a></td><td>Format: <strong>JPEG, PNG</strong><br>Image size can't be set directly — only a preset aspect ratio can be chosen.<br>Default aspect ratio and size: <strong>1:1</strong>, <strong>1024</strong>x<strong>1024</strong></td></tr><tr><td valign="top"><a href="flux/flux-kontext-max-image-to-image">flux/kontext-max/image-to-image</a></td><td>Format: <strong>JPEG, PNG</strong><br>Image size can't be set directly — only a preset aspect ratio can be chosen.<br>Default aspect ratio and size: <strong>16:9</strong>, <strong>1184</strong>x<strong>880</strong> (well, not quite 16:9)</td></tr><tr><td valign="top"><a href="flux/flux-kontext-pro-text-to-image">flux/kontext-pro/text-to-image</a></td><td>Format: <strong>JPEG, PNG</strong><br>Image size can't be set directly — only a preset aspect ratio can be chosen.<br>Default aspect ratio and size: <strong>1:1</strong>, <strong>1024</strong>x<strong>1024</strong></td></tr><tr><td valign="top"><a href="flux/flux-kontext-pro-image-to-image">flux/kontext-pro/image-to-image</a></td><td>Format: <strong>JPEG, PNG</strong><br>Image size can't be set directly — only a preset aspect ratio can be chosen.<br>Default aspect ratio and size: <strong>16:9</strong>, <strong>1184</strong>x<strong>880</strong> (well, not quite 16:9)</td></tr></tbody></table>