Stable Diffusion 3.5 Medium — SceneWorks MLX quant matrix

Pre-built, turnkey MLX tiers of Stability AI Stable Diffusion 3.5 Medium — the 2.5B MMDiT-X (dual-attention) mid-tier, renders up to 1440² for SceneWorks, hosted as separate downloadable artifacts so the app loads a tier directly with no on-device conversion peak (sc-8513, epic 8506).

Each subdirectory is a complete from_snapshot-loadable diffusers tree — packed/dense transformer/ plus the dense triple text encoder (CLIP-L + CLIP-G + T5-XXL), tokenizers, and 16-ch VAE:

Tier	`transformer/` precision	Use
`q4/`	Q4 (asymmetric group-affine, group-64) — default	lowest memory
`q8/`	Q8 (asymmetric group-affine, group-64)	near-lossless
`bf16/`	dense bf16 (the source backbone, no quantization)	highest fidelity, high-memory Macs

Only the MMDiT transformer is quantized; the text encoders and VAE are reused dense in every tier. The packed weights auto-detect their quantization on load.

License & attribution

This model is a derivative of Stable Diffusion 3.5 Large and is distributed under the Stability AI Community License (free for research, non-commercial, and commercial use by organizations with under $1M in annual revenue; see the license for terms).

This Stability AI Model is licensed under the Stability AI Community License, Copyright © Stability AI Ltd. All Rights Reserved.

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