Using FLUX 3 Image Klein on Black Forest Labs
Implementation guide · FLUX 3 · Black Forest Labs
Black Forest Labs exposes FLUX 3 Image Klein through model ID flux-3-image-klein. Use the setup steps, capabilities, and official provider links below to validate this route before deployment.
Last refreshed 2026-10-20. Next refresh: weekly.
Quick Start
- 1
- 2Use the Black Forest Labs SDK or REST API to call
flux-3-image-klein— see the documentation for request format.
Code Examples
Capabilities
About FLUX 3 Image Klein
FLUX 3 Image Klein is Black Forest Labs' 5.6-billion-parameter open-weights image generation and editing model, released October 15, 2026 as a smaller version of FLUX 3 Image. It supports text-to-image, image editing, up to ten reference images and bounding-box layouts, with output from 768 x 768 up to 4K. The distilled model runs 16 steps (a 50-step Klein Base is published for fine-tuning and LoRA) and fits consumer GPUs down to 8GB VRAM with the INT8 build. The BFL API serves it as flux-3-image-klein from $0.008 to $0.036 per image; weights are on Hugging Face under the FLUX Kommunity License.