Juggernaut Z Fast is the speed-focused release of Juggernaut Z. It keeps the cinematic, polished Juggernaut look while targeting 4-step generation for lower latency and lower compute cost. Think of it as the Fast/Turbo-style companion to the full Juggernaut Z release.
This repository hosts the official RunDiffusion Fast release artifacts: Fast safetensors variants and GGUF quantizations. The Diffusers export will be added at the repository root when available.
Why Fast
- 4-step generation for quick iteration and lower cost
- Strong Juggernaut Z visual identity with cinematic lighting and polished composition
- Better fit for high-volume workflows where the full model's 25-45 step range is too slow
- Useful for previewing, concept passes, product mockups, social content, and fast prompt exploration
- Available in full Fast weights, FP16, FP8, and GGUF quantized variants
Recommended Settings
| Parameter | Recommendation |
|---|---|
| Steps | 4 |
| Workflow | Use a Fast/Turbo-compatible Z-Image workflow |
| CFG | Start with the workflow default; avoid full-model high-step settings |
| Use case | Fast previews, lower-cost production passes, text-layout checks, product and portrait exploration |
The full Juggernaut Z model is still the better choice when you want slower high-step refinement. Use this Fast release when speed and cost matter.
Files In This Repo
| File | Format | Notes |
|---|---|---|
JuggernautZ_Fast_by_RunDiffusion.safetensors | safetensors | Original Fast release weights |
Juggernaut_Z_V1_Fast_FP16.safetensors | safetensors fp16 | Half-precision Fast weights |
Juggernaut_Z_V1_Fast_FP8_e4m3fn.safetensors | safetensors fp8 e4m3fn | Lower VRAM footprint |
Juggernaut_Z_V1_Fast_by_RunDiffusion_q8_0.gguf | GGUF q8_0 | Highest-quality quant |
Juggernaut_Z_V1_Fast_by_RunDiffusion_q6_k.gguf | GGUF q6_k | Balanced quality and size |
Juggernaut_Z_V1_Fast_by_RunDiffusion_q5_k_m.gguf | GGUF q5_k_m | Medium quant |
Juggernaut_Z_V1_Fast_by_RunDiffusion_q5_k_s.gguf | GGUF q5_k_s | Smaller q5 quant |
Juggernaut_Z_V1_Fast_by_RunDiffusion_q4_k_m.gguf | GGUF q4_k_m | Compact quant |
Juggernaut_Z_V1_Fast_by_RunDiffusion_q4_k_s.gguf | GGUF q4_k_s | Smallest footprint |
Example Gallery
The examples below are pulled from the RunDiffusion asset library for the juggernaut z fast release collection and organized by the categories used during curation.
Click any example image to open the larger CDN version.
| Category | Count |
|---|---|
| People | 30 |
| Text generation | 12 |
| Art & concept | 17 |
| Architecture & interiors | 10 |
| Product & branding | 9 |
| Nature & travel | 4 |
| Food & beverage | 3 |
People
Editorial portraits, fashion, lifestyle, sports, and cinematic character studies.
| 05 - Playful Beauty Makeup Portrait | 08 - Floral Dress Park Portrait | 18 - Boxer Athlete Portrait |
| 22 - Neon Streetwear Alley Portrait | 24 - Red Gown Fern Garden Fashion | 26 - Gold Editorial Lounge Fashion |
| 27 - Soft Window Light Portrait | 28 - Black And White Menswear Portrait | 29 - Glamour Undercut Beauty Portrait |
| 30 - Moody Male Close Up | 31 - Neon Runner Activewear | 33 - White Lace Beauty Close Up |
| 35 - Tactical Black Outfit Portrait | 36 - Friendly Laptop Workspace Portrait | 37 - Bohemian Desert Fashion Portrait |
| 38 - Businessman Running Neon City | 39 - Library Suit Portrait | 40 - Soft Transit Window Portrait |
| 41 - White Sunglasses Fashion Close Up | 42 - Neon Hallway Curly Hair Portrait | 43 - Quiet Kitchen Texting Portrait |
| 45 - Color Gel Beauty Portrait | 47 - Green Light Young Man Portrait | 48 - Neon Crowd Phone Portrait |
| 51 - Yellow Metro Fashion Portrait | 60 - Grocery Clerk Portrait | 61 - Redhead Cafe Portrait |
| 63 - Black And White Fashion Villain Portrait | 76 - Armored Bearded Warrior Portrait | 79 - Tea House Red Dress Portrait |
Text Generation
Readable typography examples: signs, headlines, apparel text, chalkboards, captions, and brand copy.
| 65 - Typewriter Juggernaut Text | 66 - Midnight Diner Neon Sign | 67 - Rebel Without A Cause Jacket Text |
| 68 - Aeterna Est Stone Inscription | 69 - Future Is Now Newspaper | 70 - Unsolved Chalkboard Question |
| 71 - California Surf Club T Shirt | 72 - Danger Zone Road Sign | 74 - Revolution Graffiti Wall |
| 75 - Astronaut Going Home Caption | 77 - RunDiffusion Monitor Ad Copy | 85 - Readable Chalkboard Paragraph |
Art & Concept
Fantasy, sci-fi, surreal scenes, illustration tests, creature design, and concept-art style outputs.
| 01 - Rain-Soaked Cinematic Warrior Portrait | 07 - Neon Futuristic Building | 09 - Ocean Double Exposure Portrait |
| 16 - Fashion Sketch Evening Gown | 20 - Armored Fantasy Battle Warrior | 21 - Classical Roman Emperor Portrait |
| 53 - Floral Green Statue Portrait | 57 - Robot Scarecrow With Birds | 58 - Dark Floral Creature Mask |
| 64 - Sketch To Portrait Comparison | 73 - Zombie Street Character | 78 - Cyborg Face Close Up |
| 80 - Cybernetic Villain Pointing | 81 - Cat Chase Market Scene | 82 - Ballerina On Asteroid |
| 83 - Teddy Bear Ghost Encounter | 84 - Skull Flowers Pocket Watch |
Architecture & Interiors
Modern homes, interiors, classical facades, brutalist structures, and cinematic building studies.
| 02 - Cliffside Glass Ocean House | 03 - Brutalist Concrete Tower | 04 - Sunlit Minimal Interior Lounge |
| 06 - Classical White Facade | 10 - Japanese Courtyard Interior | 11 - Cathedral Light Interior |
| 14 - Desert Modern White House | 17 - Luxury High Rise Interior | 19 - Angular Metal Museum Exterior |
| 23 - Indoor Jungle Lounge |
Product & Branding
Product mockups and brand/logo tests showing how Fast handles commercial-style compositions and text-bearing objects.
| 44 - RunDiffusion Watch Product Shot | 46 - RunDiffusion Sneaker Ad | 49 - RunDiffusion Skincare Jar |
| 50 - RunDiffusion Smartphone Display | 52 - RunDiffusion Whiskey Bottle | 54 - RunDiffusion Coffee Bag |
| 56 - RunDiffusion Headphones Product Shot | 59 - RunDiffusion Burger Wrapper | 62 - RunDiffusion Sunglasses Beach Product |
Nature & Travel
Landscape, travel, outdoor, and environmental examples.
| 13 - Rainforest Dog Portrait | 25 - Sunset Field Silhouette | 32 - Coastal Cliffs Landscape |
| 55 - Blue Scarf Flower Field Fashion |
Food & Beverage
Food, drinks, cafe, cocktail, and still-life examples.
| 12 - Butterflies Over Morning Coffee | 15 - Cocktail Ice Splash | 34 - Berry Pancake Stack |
Diffusers
A Fast Diffusers export is planned. When added, it will use the same root-level component layout as RunDiffusion/Juggernaut-Z-Image:
model_index.json
transformer/
text_encoder/
tokenizer/
vae/
scheduler/
Until then, use the standalone Fast .safetensors variants with the workflow that matches your local inference stack, or use the .gguf variants with a GGUF-compatible runtime.
Links
- Run Juggernaut Z on RunDiffusion -> rundiffusion.com/juggernaut-z
- Full Juggernaut Z release -> RunDiffusion/Juggernaut-Z-Image
- Base model -> Tongyi-MAI/Z-Image
Attribution
Juggernaut Z Fast is built on the Z-Image family and released by Team Juggernaut, with training by KandooAI, published by RunDiffusion.
License & Commercial Use
Juggernaut Z Fast is released under CC BY-NC 4.0:
- BY: attribute RunDiffusion / Team Juggernaut / KandooAI when sharing output.
- NC: non-commercial use only. You may not use the model, or its outputs in a workflow, for commercial purposes without a license.
You are free to fine-tune, merge, build LoRAs, and otherwise modify the model for non-commercial purposes.
For commercial licensing, custom models, business inquiries, or consultation, contact juggernaut@rundiffusion.com.