Releasesby GlyphFLUX 3 Image: Custom Output Sizes and Better Edits
The FLUX 3 Image API now supports custom width and height parameters for output images. It also includes a match_input resolution setting for more accurate edits using reference images.
Also shipped Oct 22, 2026Black Forest Labs in October 2026 →
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Replit Monitoring Agent: Your very own software engineering team
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Gemini Enterprise: Single-user quota limits
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More from FLUX APIEvery FLUX API release →
Key Features
- Exact size: send width and height for any size from 256px per side up to 16.8MP ( 4k ), at aspect ratios up to 8:1. With reference images, the limit is 4MP. width and height override resolution and aspect_ratio Same size as input image: with resolution: "match_input" , an edit is the same size as the first reference image, up to 4MP.
Endpoint
FLUX 3 Image API reference
FLUX 3 Image Klein
FLUX 3 Image Klein is a 5.6B parameter version of FLUX 3 Image with open weights. It supports the same features: text to image, image editing, multi reference, and bounding boxes. Run it through the API, download the weights from Hugging Face, or load it in ComfyUI.
Key Features
- Same request as FLUX 3 Image: prompt , images , aspect_ratio , resolution , and the bounding box format are unchanged. A FLUX 3 Image request runs on Klein by switching the endpoint Two variants: Klein (Distilled) runs 16 steps at CFG 1 for fast inference.
Endpoint
FLUX 3 Image Klein API reference
Weights
- FLUX 3 Image Klein (Distilled) FLUX 3 Image Klein Base ComfyUI weights and the ComfyUI Klein workflow Start with the FLUX 3 Image Klein overview .
FLUX 3 Image
FLUX 3 Image gives you maximum control over every pixel. Generate an image from a prompt, edit specific parts of an image, and combine up to ten references, all through one endpoint.
Key Features
- Bounding boxes in the prompt: place every element of a layout, such as a headline, a face in a crowd, or each panel of a grid. Add a JSON list of boxes to the end of prompt ; there is no separate parameter Pixel-exact local edits: mark the element to change and keep the rest of the image as it was.