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Overview

Stable Diffusion Overview

Stable Diffusion is an open-source AI image generation model developed by Stability AI, which has rapidly become the world's most popular AI art foundation model since its 2022 release. Its defining feature is being fully open-source — users can freely download model weights and run them locally without internet access or subscriptions.

The latest Stable Diffusion 3.5 series includes Large (8B parameters), Large Turbo, Medium, and Flash variants, achieving new heights in image quality and prompt adherence. Stability AI also offers DreamStudio web app and Developer Platform API serving everyone from individual creators to enterprise users.

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Core Features

Text to Image: Generate high-quality images from text descriptions in virtually any artistic style and composition
Image to Image: Use a reference image as a base for style transfer or content transformation
Inpainting: Use masks to selectively modify specific regions while preserving the rest
Outpainting: Seamlessly extend the canvas in any direction with new content
Upscaling: Creative Upscaler (4K AI upscale), Conservative Upscaler (faithful upscale), Fast Upscaler (quick 4x)
Background Removal: One-click background removal while preserving the foreground subject
Background Replace & Relight: Swap backgrounds and adjust lighting to match the subject
Style Control: Structure (structural guidance), Sketch (line art guidance), Style Guide (style reference), Style Transfer
3D Generation: Stable Fast 3D generates high-quality 3D assets from a single 2D image
Audio Generation: Stable Audio 2 generates up to 3 minutes of high-quality audio from text prompts
Local Deployment: Run locally via AUTOMATIC1111, ComfyUI, and other tools

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How to Use

Web App (DreamStudio)

Visit dreamstudio.stability.ai
Register — new users receive 25 free credits
Enter your prompt, select model, size, and style parameters
Generate and pay per credit consumed

API Integration

import requests
response = requests.post(
    'https://api.stability.ai/v2beta/stable-image/generate/ultra',
    headers={
        'authorization': 'Bearer YOUR_API_KEY',
        'accept': 'image/*'
    },
    files={'none': ''},
    data={
        'prompt': 'A futuristic cityscape at sunset',
        'output_format': 'webp'
    }
)
with open('output.webp', 'wb') as f:
    f.write(response.content)

Register at platform.stability.ai for your API key
Full docs: platform.stability.ai/docs/api-reference

Local Deployment

Download model weights: huggingface.co/stabilityai
Recommended UIs: AUTOMATIC1111 WebUI or ComfyUI
Supports Windows/macOS/Linux; NVIDIA GPU recommended (8GB+ VRAM)

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Key Advantages

Fully Open Source: Free model weights, local execution, no privacy concerns, no usage limits
Richest Community Ecosystem: World's largest AI art open-source community with tens of thousands of custom models (LoRA, Checkpoints), plugins, and workflows
Highly Customizable: Supports LoRA fine-tuning, ControlNet precision control, and custom training for professional creative needs
Multimodal Coverage: Image, video, 3D, and audio generation — one platform for diverse creative needs
Enterprise-Ready: Self-hosted licensing, enterprise deployment, AWS/Azure cloud platform integration
Cost-Effective: Zero marginal cost for local deployment; transparent credit-based API pricing
Continuous Innovation: SD 3.5 series pushes boundaries in image quality and prompt understanding
Widely Adopted: Used by HubSpot, EA, Lenovo, NVIDIA, Universal Music Group, and more

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Pricing

Free Options

Local Deployment: Downloading open-source model weights is completely free — just provide your own hardware
API Free Credits: Register at platform.stability.ai for 25 free credits ($0.25 value)

API Credit Pricing (1 credit = $0.01)

Image Generation

Service	Price (credits/image)
Stable Image Ultra (SD 3.5 Large)	8 credits ($0.08)
Stable Diffusion 3.5 Large	6.5 credits ($0.065)
SD 3.5 Large Turbo	4 credits ($0.04)
SD 3.5 Medium	3.5 credits ($0.035)
SD 3.5 Flash	2.5 credits ($0.025)
Stable Image Core	3 credits ($0.03)

Image Editing: 5–8 credits/operation Upscaling: 2–60 credits/operation 3D Generation: 4–10 credits/operation

Full pricing: platform.stability.ai/pricing
Enterprise plans: stability.ai/enterprise

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Get Help

Support & Resources

Developer Platform: platform.stability.ai — API docs, credit management
API Reference: platform.stability.ai/docs/api-reference
Learning Hub: stability.ai/learning-hub — tutorials and best practices
Customer Stories: stability.ai/customer-stories
News: stability.ai/news
Research: stability.ai/research
Contact: stability.ai/contact
Enterprise: stability.ai/enterprise
Hugging Face: huggingface.co/stabilityai — model downloads

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Download Client

Download & Access

DreamStudio Web: dreamstudio.stability.ai — no install needed
Developer API: platform.stability.ai — register for API key
Open Source Models: huggingface.co/stabilityai — all model weights
Local Deployment UIs:
- AUTOMATIC1111 WebUI — most popular local interface
- ComfyUI — node-based workflow interface
- InvokeAI — professional creative interface
Cloud Platforms: AWS Bedrock, Azure, Google Cloud deployment supported
Stable Audio: stableaudio.com — standalone audio generation app

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Other Info

Additional Information

Company: Stability AI, London, UK — globally distributed team
Model Lineage: SD 1.x → SD 2.x → SDXL → SD 3.0 → SD 3.5 (current)
License: SD 3.5 uses Stability AI Community License — commercial use requires annual revenue under $1M or a commercial license purchase
Partners: ARM, AWS, Lenovo, Microsoft Azure, NVIDIA, HubSpot, EA, Universal Music Group, Warner Music Group
Use Cases: Marketing assets, game assets, film production, e-commerce product images, personal creative work
Safety Policy: stability.ai/safety — responsible AI usage guidelines