The open-source powerhouse - total creative control with unlimited customization
Completely free to self-host; Stability API from ~$0.03/image
What Is Stable Diffusion 3.5?
Stable Diffusion 3.5 is an AI image generation model developed by Stability AI. Stable Diffusion 3.5 is the latest open-weight image generation model from Stability AI, available in three variants: Large (8B params), Large Turbo (fast inference), and Medium (2.5B params for consumer GPUs). Built on the MMDiT architecture with improved text rendering and composition. For creators who want full control - custom LoRAs, fine-tuned characters, NSFW-unrestricted outputs, and zero per-image costs - SD 3.5 with ComfyUI or Automatic1111 is unmatched.
Overview
| Description | Stable Diffusion 3.5 is the latest open-weight image generation model from Stability AI, available in three variants: Large (8B params), Large Turbo (fast inference), and Medium (2.5B params for consumer GPUs). Built on the MMDiT architecture with improved text rendering and composition. For creators who want full control - custom LoRAs, fine-tuned characters, NSFW-unrestricted outputs, and zero per-image costs - SD 3.5 with ComfyUI or Automatic1111 is unmatched. |
| Developer | Stability AI |
| Version | 3.5 (Large / Large Turbo / Medium) |
| Category | Image Model |
| Status | Open Source |
| Pricing | Completely free to self-host; Stability API from ~$0.03/image |
Capabilities8
| 1 | Open-weight with full fine-tuning support |
| 2 | LoRA and DreamBooth custom training |
| 3 | Three model variants for different hardware |
| 4 | ComfyUI and Automatic1111 integration |
| 5 | ControlNet for precise pose/composition control |
| 6 | Improved text rendering (vs SD 2.x) |
| 7 | Inpainting and outpainting |
| 8 | Zero per-image cost when self-hosted |
Model Tiers
| Tier | Speed | Quality | Pricing |
|---|---|---|---|
| SD 3.5 Medium (2.5B) | ~3s (RTX 3060) | Good | Free (self-hosted) |
| SD 3.5 Large Turbo (8B) | ~5s (RTX 4090) | Very Good | Free (self-hosted) |
| SD 3.5 Large (8B) | ~12s (RTX 4090) | Best | Free (self-hosted) |
| Stability API | ~6s | Large quality | ~$0.03/image |
Output Specs
| Max Resolution | Up to 2048×2048 (native) / higher with upscalers |
Prompting Tips
Prompt
Train a LoRA on 20 images of your brand mascot → prompt: '[mascot_lora] character holding a smartphone showing Instagram, cheerful expression, brand colors, clean background, social media promo style'
Expected Result
Consistent brand character across unlimited social posts
Prompt
Upload reference pose image → ControlNet OpenPose → 'professional influencer, studio lighting, holding product in right hand, looking at camera, minimal background, commercial photography style'
Expected Result
AI-generated image matching exact pose from reference
Prompt
ComfyUI batch workflow: 30 variations of 'aesthetic flat lay, [product], soft pastel background, overhead shot, Instagram-ready, clean minimal style' with seed incrementing
Expected Result
30 unique product shots for a month of social content
Best Fit
Best For
- ✓Custom character/brand consistency via LoRA
- ✓High-volume batch generation (zero marginal cost)
- ✓Technical creators with GPU access
- ✓ControlNet-driven precise compositions
- ✓Privacy-sensitive or offline workflows
Watch Out For
- ✗Non-technical users - requires setup and GPU knowledge
- ✗Out-of-the-box quality vs Midjourney or Flux Pro without fine-tuning
Access Via
Frequently Asked Questions
What is Stable Diffusion 3.5?
Stable Diffusion 3.5 is a image AI model developed by Stability AI. The open-source powerhouse - total creative control with unlimited customization. Stable Diffusion 3.5 is the latest open-weight image generation model from Stability AI, available in three variants: Large (8B params), Large Turbo (fast inference), and Medium (2.5B params for consumer GPUs). Built on the MMDiT architecture with improved text rendering and composition. For creator...
How much does Stable Diffusion 3.5 cost?
Completely free to self-host; Stability API from ~$0.03/image. SD 3.5 Medium (2.5B): Free (self-hosted); SD 3.5 Large Turbo (8B): Free (self-hosted); SD 3.5 Large (8B): Free (self-hosted); Stability API: ~$0.03/image
What can Stable Diffusion 3.5 create?
Stable Diffusion 3.5 is best for: Custom character/brand consistency via LoRA, High-volume batch generation (zero marginal cost), Technical creators with GPU access, ControlNet-driven precise compositions, Privacy-sensitive or offline workflows. Key capabilities include Open-weight with full fine-tuning support, LoRA and DreamBooth custom training, Three model variants for different hardware, ComfyUI and Automatic1111 integration.
How do you access Stable Diffusion 3.5?
Stable Diffusion 3.5 is available through: Hugging Face (marketplace), ComfyUI (marketplace), Stability AI API (api), Automatic1111 WebUI (marketplace).
Is Stable Diffusion 3.5 free to use?
Yes, Stable Diffusion 3.5 offers free access. Free (self-hosted).