FLUX.2 [klein] 4B & 9B - Fast local image editing and generation
High-speed image editing with compact Flux 2 Klein models, now supported in ComfyUI.
FLUX.2 [klein] 4B & 9B are the fastest image models in the Flux family, unifying image generation and image editing in a single, compact architecture.
Designed for interactive workflows, immediate previews, and latency-critical applications, FLUX.2 [klein] delivers state-of-the-art image quality with end-to-end inference around one second on distilled variants—enabling creative iteration at a pace that wasn’t previously practical with diffusion models.
Two Models, Two Types
FLUX.2 [klein] is released across two model types, each available at 4B and 9B parameters:
Base (Undistilled)
Full training signal and model capacity
Optimized for fine-tuning, LoRA training, and post-training workflows
Maximum flexibility and control for research and customization
Distilled (4-Step)
4-step distilled for the fastest inference
Built for production deployments, interactive applications, and real-time previews
Optimized for speed with minimal quality loss
Model Lineup and Performance
9B distilled — 4 steps · ~2s (5090) · 19.6GB VRAM
9B base — 50 steps · ~35s (5090) · 21.7GB VRAM
4B distilled — 4 steps · ~1.2s (5090) · 8.4GB VRAM
4B base — 50 steps · ~17s (5090) · 9.2GB VRAM
Both sizes support text-to-image and image editing, including single-reference and multi-reference workflows.
9B vs 4B: Choosing the Right Scale
FLUX.2 [klein] 9B Base
The undistilled foundation model of the Klein family.
Maximum flexibility for creative exploration and research
Best suited for fine-tuning and custom pipelines
Ideal where full model capacity and control are required
FLUX.2 [klein] 9B (Distilled)
A 4-step distilled model delivering outstanding quality at sub-second speed.
Optimized for very low-latency inference
Near real-time image generation and editing
Available exclusively through the Black Forest Labs API
FLUX.2 [klein] 4B Base
A compact undistilled model with an exceptional quality-to-size ratio.
Efficient local deployment
Strong candidate for fine-tuning on limited hardware
Flexible generation and editing workflows with low VRAM requirements
FLUX.2 [klein] 4B (Distilled)
The fastest variant in the Klein family.
Near real-time image generation and editing
Built for interactive applications and live previews
Sub-second inference with minimal overhead
Editing Capabilities
Both FLUX.2 [klein] 4B models support image editing workflows, including:
Style transformation
Semantic changes
Object replacement and removal
Multi-reference composition
Iterative edits across multiple passes
Single-reference and multi-reference inputs are supported, enabling controlled transformations while maintaining visual coherence.
Get Started
Update to the latest version of ComfyUI
Browse Templates and look for Flux.2 Klein 4B & 9B under Images, or download the workflows
Download the models when prompted
Upload your image and adjust the edit prompt, then hit run!