Black Forest Labs Releases FLUX 3 Image Klein As 5.6B Open Model
Black Forest Labs is shipping the open-weight version of FLUX 3 Image weeks after the closed model, and the published benchmarks put the output within reach of consumer GPUs rather than datacenter hardware.
Key Facts
- Black Forest Labs released FLUX 3 Image Klein as an open model on October 15, 2026.
- FLUX 3 Image Klein has 5.6 billion parameters and runs on general consumer gaming PCs.
- The release includes two versions: FLUX 3 Image Klein Base for additional training and a distilled low-step model.
- Both versions are downloadable from Hugging Face, and ComfyUI supports running FLUX 3 Image Klein.
- At 1024x1024 pixels, FLUX 3 Image Klein generates an image in 8.9 seconds on a GeForce RTX 4070.
Reporting from 1 source: GIGAZINE.
Black Forest Labs released the image generation and editing model FLUX 3 Image Klein as an open model on October 15, 2026. The model has 5.6 billion parameters and is built on the same technology as the closed FLUX 3 Image. It ships in two versions: the base model FLUX 3 Image Klein Base for additional training, and a distilled low-step model. Both are downloadable from Hugging Face, and ComfyUI already supports running the model. Black Forest Labs says the model can render text and characters at specified positions inside an image, and it can render Japanese text at high quality. The company reports that at 1024x1024 pixels the distilled model generates an image in 8.9 seconds on a GeForce RTX 4070, while the base model takes 38.0 seconds on a GeForce RTX 4070 and 12.5 seconds on a GeForce RTX 5090.
The model runs on general consumer PCs, including gaming PCs, which is the pitch behind the 5.6 billion parameter count. Black Forest Labs published two performance graphs alongside the release set: one comparing generation quality against model scale across image generation and image editing, and one charting per-image generation time for the distilled model at 16 steps. The speed figures are split by version, with the distilled low-step model and the base model both benchmarked at 1024x1024 pixels on the same cards.
ComfyUI support arrived at the same time as the weights. The release follows FLUX 3 Image, the closed model that Black Forest Labs described as supporting up to 4K generation, subject position specification, and partial editing. FLUX 3 Image Klein is offered for image generation and image editing under one model.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.