Stable Diffusion 3.5 Large
Still Stability's latest image model family (no official SD4 as of 2026-09; SD4 'news' articles are unverified). API model values for /generate/sd3: sd3.5-large, sd3.5-large-turbo, sd3.5-medium (from third-party docs; official API ref is JS-rendered, not verified). Pricing (credits) not verified.
- Input
- text, image
- Output
- image
- License
- Stability AI Community License
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| Stability AI API | sd3.5-large | https://api.stability.ai/v2beta/stable-image/generate/sd3 | docs |
| Hugging Face | — | huggingface.co/stabilityai/stable-diffusion-3.5-large | — |
| Hugging Face (Large Turbo) | — | huggingface.co/stabilityai/stable-diffusion-3.5-large-turbo | — |
| Hugging Face (Medium) | — | huggingface.co/stabilityai/stable-diffusion-3.5-medium | — |
Notable capabilities (2)
- Open MMDiT weights, free for small businesses: 8B Multimodal Diffusion Transformer with open weights under a Community License free for commercial use under $1M annual revenue. source
- Broad hardware optimization (found after launch): Official TensorRT/FP8 (NVIDIA, ~2x faster, 40% less memory), ONNX AMD GPU and AMD NPU builds released later. source
Main open-weight Stability image model; widely used with ComfyUI/diffusers and fine-tunes.
curl -X POST https://api.stability.ai/v2beta/stable-image/generate/sd3 -H "Authorization: Bearer $STABILITY_API_KEY" -H "Accept: image/*" \
-F prompt="a lighthouse at dusk, oil painting" -F model=sd3.5-large -o out.png
Sources: https://huggingface.co/stabilityai/stable-diffusion-3.5-large , https://stability.ai/news-updates , https://platform.stability.ai/docs/api-reference