Model: Stable Diffusion 3.5 Large (family: stable-diffusion)
Parameters: 8.1B
Mixture-of-experts: no
Released: 2024-10
Modality: image
License: Stability Community License (commercial use: conditional)
License note: Free for commercial use under $1M annual revenue; an enterprise license is required above that.
Architecture: mmdit
Backbone parameters: 8.1B
Backbone size (GB by quant): fp16: 16.5
fp8: 14.9
q8: 8.78
q4: 4.77
Components:
name: CLIP-L text encoder
fp16_gb: 0.25
offloaded: no
name: OpenCLIP-G text encoder
fp16_gb: 1.39
offloaded: no
name: T5-XXL text encoder
fp16_gb: 9.79
fp8_gb: 4.89
q4_gb: 2.9
offloaded: yes
VAE size: 0.17 GB
Native resolution: 1024×1024
Sampling steps: 28-40
Recommended memory: gb: 7
quant: Q4 GGUF
No-offload memory: 19 GB
Offload floor: 5 GB
Device classes: mac
nvidia
amd
iphone
Tools: ComfyUI
Draw Things
diffusers
Notes: 8.1B MMDiT with three text encoders (CLIP-L, OpenCLIP-G, T5-XXL). The 9.8GB T5-XXL is offloaded to CPU after prompt-encoding, so peak VRAM tracks the backbone, not the sum. At Q4 GGUF (4.77GB backbone) with T5 offloaded, peak is ~7GB (synthesis from city96 component sizes plus the diffusers offload behavior, not a single measurement). Stability's full-fp16 baseline is 19GB (11GB with TensorRT fp8). Sources: Stability SD3.5 announcement, city96 SD3.5 GGUF repo, Stability TensorRT note, diffusers SD3 docs.