Fast SDXL
High-Speed LoRA & Embedding Generation
Fast SDXL by Stability AI delivers high-speed AI image generation at just 10 credits per generation. Supports LoRA, embeddings, and negative prompts for versatile creative output.
Create stunning AI art & videos. No login needed.
What Is Fast SDXL?
Fast SDXL is a high-speed image generation model built on the Stable Diffusion XL architecture by Stability AI. It produces quality images in under 2 seconds at just 10 credits per generation, making it the most affordable option on VesperAPI. With LoRA and embedding support, negative prompts, and six aspect ratio presets, Fast SDXL is ideal for rapid prototyping, bulk content creation, and creative experimentation.
Features
Blazing Fast Generation Speed
Generate quality images in under 2 seconds with Fast SDXL's optimized inference pipeline. At just 10 credits per generation, it is the most cost-effective model on VesperAPI, enabling rapid iteration and high-volume content production without breaking the bank. Perfect for users who need speed and affordability.
Fast SDXL LoRA & Embedding Support
Generate images in a wide variety of artistic styles without compromising on quality or speed. Fast SDXL handles photorealistic photography, digital illustration, anime art, oil painting effects, and abstract compositions with equal proficiency. The model's versatile style engine interprets your style directions accurately, giving you creative freedom to explore any visual aesthetic.
Battle-Tested SDXL Architecture
Get professional-quality output suitable for commercial use across digital and print media. Fast SDXL generates images with clean details, accurate colors, and strong compositions that meet the standards required for marketing materials, social media campaigns, and professional presentations without additional post-processing or enhancement.
Fast SDXL Use Cases
Explore practical applications where speed and affordability make Fast SDXL the ideal choice.
Learning & Experimentation
Perfect for beginners learning AI image generation. At 10 credits per generation, experiment with prompts, explore different styles, and build prompt engineering skills without a large investment. Fast SDXL's speed lets you iterate rapidly and learn through hands-on practice.
LoRA Style Exploration
Explore thousands of community-trained LoRA styles with Fast SDXL. Apply anime, photorealistic, watercolor, and dozens of other styles to your generations using freely available LoRA weights. Create unique visual aesthetics without training models from scratch.
Rapid Mockups & Drafts
Generate quick visual mockups and concept drafts with Fast SDXL's sub-2-second generation speed. Ideal for early-stage ideation, creating placeholder images for presentations, and testing visual directions before committing credits to premium models.
Educational & Research Projects
Use Fast SDXL in classrooms, workshops, and research projects without budget constraints. At 10 credits per generation, it makes AI image generation accessible for students, educators, and researchers to explore creative AI applications hands-on.
How to Use Fast SDXL on VesperAPI
Follow these three simple steps to generate stunning images with Fast SDXL in seconds, from writing your prompt to downloading your final result.
1. Write Your Prompt
Begin by entering a descriptive text prompt in the input field. Be specific about the subject, style, lighting, and mood you want. For example, instead of just writing 'a cat', try 'a fluffy orange tabby cat sitting on a windowsill at golden hour, warm sunlight streaming through lace curtains, soft bokeh background, photorealistic style'. The more detail you provide, the better Fast SDXL can interpret your vision. You can also specify negative prompts to exclude unwanted elements.
2. Adjust Settings
Choose your desired output settings including aspect ratio, image resolution, and the number of variations you want to generate. Fast SDXL supports multiple aspect ratios including square, landscape, and portrait formats. You can also adjust the guidance scale to control how closely the model follows your prompt — higher values produce more faithful interpretations while lower values allow more creative freedom. Select your preferred style preset if available, and fine-tune any additional parameters to match your creative intent.
3. Generate and Download
Click the Generate button and watch Fast SDXL create your image in seconds. Review the results, and if needed, refine your prompt or adjust settings to get closer to your desired output. You can generate multiple batches to explore different creative directions. Once satisfied, download your image in high resolution. Fast SDXL's speed makes it easy to iterate rapidly, so don't hesitate to experiment with different prompts and settings until you achieve the perfect result.
Technical Specifications
Under the hood of Fast SDXL — architecture, performance benchmarks, and API parameters.
Fast SDXL vs Other Image Models
Fast SDXL delivers the lowest credit cost on VesperAPI at just 10 credits per generation — the same as FLUX.1 Schnell but with the added benefit of LoRA support. Compared to FLUX.2 Pro and Ideogram V3 (30 credits each), Fast SDXL is 3x more affordable. While it produces slightly lower quality output, it excels in speed and versatility for rapid creative workflows.
| Model | Credits/gen | Max Resolution | Speed | LoRA Support |
|---|---|---|---|---|
| Fast SDXL | 10 | 1024 × 1024 | < 2s | Yes |
| FLUX.1 Schnell | 10 | 2048 × 2048 | < 1s | No |
| FLUX.2 Pro | 30 | 2048 × 2048 | ~3s | Yes |
| Ideogram V3 | 30 | 1024 × 1024 | ~4s | No |
Fast SDXL Is Best For
Discover the ideal use cases where Fast SDXL delivers maximum value at the lowest credit cost.
Learning and Experimentation
Perfect for beginners exploring AI image generation for the first time. At just 10 credits per generation, Fast SDXL's low cost and rapid speed make it the ideal starting point for anyone curious about AI art. Experiment with prompts, learn prompt engineering through trial and error, and build confidence with AI-powered creative tools before exploring more advanced models and techniques.
Quick Social Media Content
Create eye-catching visuals for social media posts in seconds. Its speed advantage means you can generate custom graphics for every post, maintaining a fresh and engaging visual presence across all your social media channels. Produce unique imagery that stands out in crowded feeds and drives higher engagement rates with your audience.
SDXL Ecosystem Integration
As part of the open-source SDXL ecosystem, outputs are compatible with a wide range of post-processing tools, LoRA models, and community resources. Integrate this model into existing workflows, combine outputs with ControlNet processing, or use generated images as starting points for further refinement with other ecosystem tools and techniques.
Pro Tips for Fast SDXL
Get the most from Fast SDXL with these practical tips.
#1Use Negative Prompts for Cleaner Output
Add negative prompts to exclude unwanted elements from your generation. Common negative prompt terms include 'blurry, low quality, distorted, watermark, text, ugly, deformed' to ensure clean, high-quality output. Negative prompts are especially powerful with Fast SDXL because they help the model focus on producing polished results by explicitly steering it away from common failure patterns and unwanted visual artifacts.
#2Keep Prompts Under 75 Tokens
Fast SDXL processes prompts most effectively within the first 75 tokens, so focus your creative description on the most important visual elements. Lead with the main subject and style, then add supporting details like lighting, mood, and color palette. This focused approach helps the model allocate its processing power to the elements that matter most for your creative vision.
#3Specify an Art Style for Better Results
Explicitly specifying an art style dramatically improves output consistency and quality. Whether you want 'photorealistic', 'anime illustration', 'oil painting', 'watercolor', or 'digital art', including a clear style directive helps Fast SDXL apply the appropriate visual treatment. You can also reference specific artistic influences or combine styles for unique creative results.
#4Use Aspect Ratio Keywords
Include aspect ratio descriptors like 'wide panorama,' 'portrait orientation,' or 'square format' in your prompt to guide the model's compositional decisions. While you can set the technical aspect ratio in the generation settings, adding descriptive language about the intended composition helps the model arrange elements optimally within the chosen frame for more balanced and visually pleasing results.
Fast SDXL Gallery
Fast and creative — see what Fast SDXL can generate for you.
"A charming European village with cobblestone streets and colorful houses, watercolor painting style, soft pastel tones, morning mist, quaint cafes with flower boxes."
"Interior of a futuristic space station with curved white walls, holographic displays, large viewing window showing Earth below, clean sci-fi aesthetic, soft blue lighting."
"A winding forest trail covered in golden autumn leaves, tall maple trees with red and orange foliage, dappled sunlight filtering through branches, serene and peaceful atmosphere."
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Start Creating with Fast SDXL
Just 10 credits per generation. Create your first AI image in under 2 seconds with the most cost-effective model on VesperAPI.
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