The Decoder · 10/16/2026, 00:57:14
Black Forest Labs Releases Open-Weights FLUX 3 Image Klein: 5.6B Model Enables 4K Generation on 8GB VRAM
Black Forest Labs released FLUX 3 Image Klein, a 5.6-billion-parameter open-weights model that outperforms closed competitors like Ideogram V4.5 in internal Elo tests. It supports native 4K output, pixel-accurate editing, and multi-reference generation while running on consumer GPUs with just 8 GB of VRAM.
SOURCE COVERAGEFull Original Report
Oct 15, 2026
Black Forest Labs has released FLUX 3 Image Klein, a 5.6-billion-parameter open-weights model for text-to-image generation, image editing, and generation with up to ten reference images. It supports native 4K output, pixel-accurate editing, and bounding boxes for element placement. Black Forest Labs says it scores the highest Elo ratings among all open models in internal testing, beating closed competitors Ideogram V4.5 and even BFL's own FLUX.2 [pro]. It gains 91 Elo points over FLUX.2 [klein] with 38 percent fewer parameters than that model's 9 billion.
Sample images from Black Forest Labs. | Image: BFL
An INT8 build lets it run on NVIDIA GPUs with just 8 GB of VRAM, generating an image in under 9 seconds on an RTX 4070. The weights ship under the FLUX Kommunity License, free for commercial use by companies making under 0.009 per 1,000 images, as a Playground, on Hugging Face Spaces, and locally via ComfyUI and Diffusers. LoRA training works from day one through Ostris AI Toolkit and NVIDIA NeMo AutoModel.