---
title: "SD 3.5 Medium — Spacelike AI"
description: "Multimodal Diffusion Transformer · 2.5 B parameters · Stability AI"
canonical: https://spacelike.ai/models/sd-3-5-medium/
---

# SD 3.5 Medium — on dedicated hardware, by Spacelike AI

_Multimodal Diffusion Transformer · 2.5 B parameters · Stability AI_

SD 3.5 Medium is the mid-size flagship of the SD 3.5 family, released in October 2024. It uses the improved **Multimodal Diffusion Transformer (MM-DiT)** core first introduced in Stable Diffusion 3, scaled down for efficient inference on consumer hardware while retaining high-quality output at 1-megapixel native resolution.

Compared to SD 3 Medium, the 3.5 series applies QK-normalization and additional training stages to improve prompt adherence, anatomy, and fine detail. Runs on GPUs with as little as 9.9 GB VRAM.

## Specification

- **Architecture:** MM-DiT-X · improved-QK-norm · triple text encoder conditioning
- **Parameters:** 2.5 B *(backbone)*
- **Training objective:** Rectified flow matching
- **Native resolution:** 1024 × 1024 · up to ~1440 × 1440 supported
- **Text encoders:** CLIP-L + CLIP-G + T5-XXL (frozen)
- **Sampler shown:** Euler · 28 steps · cfg 4.5
- **License:** Stability AI Community License
- **Release:** October 29, 2024
- **Checkpoint:** sd3.5_medium.safetensors

## Client

[Tenstorrent Inc.](https://tenstorrent.com/) — implementation · performance optimization

## Links

- [implementation](https://github.com/tenstorrent/tt-metal/blob/main/models/tt_dit/models/StableDiffusion35.md)
- [Hugging Face](https://huggingface.co/stabilityai/stable-diffusion-3.5-medium)
- [Vendor announcement](https://stability.ai/news/introducing-stable-diffusion-3-5)

## Sample output

![SD 3.5 Medium — sample output generated by Spacelike AI](https://spacelike.ai/images/sd-3-5-medium/05.avif)

---

SD 3.5 Medium implementation by **Spacelike AI GmbH**, Vienna. Interactive viewer: https://spacelike.ai/models/sd-3-5-medium/

Sample images licensed [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) — attribute "Spacelike AI" and link back to https://spacelike.ai/.