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Black Forest Labs puts its FLUX.3 Image Klein AI model into Diffusers
FLUX.3 Image Klein, an AI image model, handles text-to-image, multi-reference editing and bounding-box placement. Two open checkpoints are out.
Summary
Black Forest Labs says FLUX.3 Image Klein is here and runs in Diffusers from day one. One model does text-to-image and multi-reference image-to-image. You write bounding boxes into the prompt to say where each part of the image goes. The distilled checkpoint makes a 1024 × 1024 image in about 2 seconds on an H100.
What changed
- One model does text-to-image and multi-reference image-to-image, with bounding boxes in the prompt for placement.
- The distilled checkpoint runs 16 steps by default. The base checkpoint runs 50 steps and is the one to fine-tune.
- NVFP4 and FP8 weights load with from_single_file, for smaller GPUs.
- LoRA training scripts cover both text-to-image and image editing.
- It ships as a Modular Diffusers pipeline, so you can pop blocks out or add your own.
Availability
Available now“Black Forest Labs FLUX.3 Image Klein is here, and it runs in Diffusers from day one.”
Founder takeaway
If you already run Diffusers on your own GPU, try the distilled checkpoint for fast drafts. Start from the base checkpoint if you plan to fine-tune a LoRA.
Source
Researched and drafted with AI from the official sources above, then checked automatically before publishing. Spotted a mistake? Tell us.
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