Stable Diffusion hosting lets you generate AI images on a remote GPU instead of your own PC. In 2026 the open image-model ecosystem includes Stable Diffusion 1.5, SDXL, SD 3.5 and the FLUX family, all of which run on rented GPUs with interfaces like ComfyUI, Automatic1111/Forge and Fooocus.
Table of Contents
Which GPU for Stable Diffusion?
| Use | GPU | VRAM | From |
|---|---|---|---|
| SD 1.5 hobby use | RTX 3060 Ti / RTX 4060 | 8 GB | $149/mo |
| SDXL, SD 3.5, FLUX.2 [klein] | RTX A4000 | 16 GB | $119/mo (VPS) |
| FLUX.1/FLUX.2, fast batches | RTX 4090 | 24 GB | $0.34/hr · €279/mo |
| FLUX.2 [dev], video | RTX 5090 / RTX A6000 | 32–48 GB | $0.33–$0.69/hr |
Best Stable Diffusion Hosting Providers
1. RunPod
- Per-second billing in 30+ regions
- Templates: vLLM, ComfyUI, PyTorch, Ollama, Jupyter
- Serverless AI endpoints
- RTX 3090 $0.22/hr · RTX 4090 $0.34/hr · A100 $1.19/hr · H100 $1.99/hr · H200 $3.59/hr (Community Cloud)
Pros
- Very cheap consumer GPUs
- Huge GPU choice up to B200
- Fast start-up
Cons
- Storage billed when stopped
- Community hosts vary
Templates for ComfyUI, Automatic1111/Forge and Fooocus; RTX 4090 $0.34/hour.
2. GPU Mart
- Dedicated GPU servers and GPU VPS (US)
- GPUs from P1000 to RTX 5090, RTX PRO 6000, A100 and H100
- One-click AI apps: Ollama, Stable Diffusion, ComfyUI
- GPU VPS from $21/mo · RTX 4090 $409/mo · RTX 5090 from $419/mo · A100 80GB $1,559/mo · H100 $2,099/mo
Pros
- Lowest monthly prices for dedicated GPUs
- Full root/admin access, Windows or Linux
- Multi-GPU servers available
Cons
- Monthly billing only
- US data centers only
One-click Stable Diffusion WebUI and ComfyUI; RTX A4000 VPS $119/month, RTX 4090 $409/month.
3. HOSTKEY
- GPU servers in the EU, UK and US
- RTX 4090, RTX 5090, RTX PRO 6000, A100, H100
- Pre-installed AI stack: Ollama, Open WebUI, ComfyUI
- GTX 1080 Ti from €70/mo · RTX 4090 €279/mo · RTX 5090 €590/mo · A100 80GB €1,300/mo · H100 €1,590/mo
Pros
- Hourly or monthly billing
- GDPR-friendly EU hosting
- Big-VRAM options
Cons
- Popular GPUs sell out
- Setup slower than cloud pods
ComfyUI images; RTX 4090 €279/month, RTX 5090 €590/month.
4. Vast.ai
- GPU marketplace, 68+ GPU types
- On-demand, interruptible and reserved pricing
- Docker templates for AI tools
- Market pricing: RTX 4090 from ~$0.30/hr · A100 80GB from ~$0.43/hr · interruptible 50%+ cheaper
Pros
- Often the lowest prices
- Per-second billing
- Great for experiments
Cons
- Host quality varies
- Not for strict compliance
Marketplace RTX 3090/4090s from about $0.30/hour.
Which Interface Should You Use?
- ComfyUI: most powerful, node-based, supports the newest models first.
- Automatic1111 / Forge: classic web UI with many extensions.
- Fooocus: simplest, Midjourney-like prompting for SDXL.
FAQ
From about $0.30/hour for an RTX 4090 on Vast.ai or RunPod, or $119/month for a 16 GB GPU VPS at GPU Mart.
FLUX models generally produce better prompt adherence and text rendering, but need more VRAM than SD 1.5 or SDXL.
Conclusion
RunPod is best for hourly Stable Diffusion; GPU Mart and HOSTKEY are best for a dedicated image-generation server.
Prices were checked in September 2026 and change often. Always confirm current pricing on the provider’s website before you order.