black-forest-labs/flux-2-klein-4b
Compact 4-billion parameter text-to-image model from Black Forest Labs. Step-distilled to 4 inference steps for sub-second generation. Unifies text-to-image and image editing in a single architecture with Apache 2.0 licensing.
Input
Default price per megapixel
Output
Example
Example output from FLUX.2 [klein] 4B
Overview
FLUX.2 [klein] 4B is a compact, Apache 2.0-licensed image generation model from Black Forest Labs. At 4 billion parameters and just 4 inference steps, it delivers sub-second generation without sacrificing quality. It uses a Mistral 3 VLM text embedder and supports up to 4 megapixel output resolution.
Key Features
- ●Sub-second inference — distilled to 4 steps for real-time applications
- ●Multi-reference editing — accepts up to 4 input images for guided generation
- ●Text rendering — strong text-in-image capabilities inherited from FLUX.2
- ●Transparent backgrounds — native RGBA PNG output support
- ●Apache 2.0 — fully commercial use permitted
Architecture
Rectified flow transformer with FLUX.2 VAE for pixel-to-latent conversion. The distilled variant uses `guidance_scale=1.0` by default. Requires ~13 GB VRAM (fits on RTX 3090/4070+).
When to Use
Ideal for high-volume production workloads, real-time applications, consumer-facing products, and edge deployment where speed and commercial licensing matter.
Frequently asked questions
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