Stable Diffusion 3.5
Stable Diffusion 3.5 is open and fast image generator with pro-level quality. It comes in three versions and runs on most GPUs with as little as 10 GB VRAM.
Overview
Stability AI dropped their SD 3.5 suite back in October 2024. It’s got three models: Large Large Turbo and Medium. If you want top quality with fine detail go Large. If speed is your thing go Turbo. If you’ve got a decent GPU and just want solid performance Medium’s your move.
The Large model runs with 8.1 billion parameters. It handles tough prompts and even typography pretty well. Turbo gives you similar quality but spits out images in just four steps. And Medium hits that sweet spot for everyday setups.
In mid 2025 Stability AI rolled out upgrades to its SD 3.5 models.
The Large one runs over twice as fast now and the Medium one got quicker too. And - it also eats way less VRAM. The Large version now only needs around 11 GB instead of the usual 19.
What made this happen? Two things. FP8 quantization and TensorRT graph tweaks made for NVIDIA RTX cards. So now more people with standard RTX 40 or 50 GPUs or even some PRO cards can use these models no problem.
Anyone can grab the models from Hugging Face and run them locally. No surprise fees or usage tiers unless you go through an API or cloud like AWS Bedrock. And here’s the deal on the license: if you or your company make under $1 million a year you’re good. You can use it for personal or business projects. Making more than that? You’ll need the Enterprise version.
Artists use it for commercial jobs or quick drafts. Studios use it for storyboards. Researchers tweak it with LoRA and fine-tuning. And small teams just like running it on their own setups. You get speed quality and control without needing a server farm.
Tags
Freeware Unknown License PC-based #Image & GraphicsLinks
This tool is free to use when installed locally and is offered under Unknown License.
SD 3.5 Medium surprised a lot of users. It runs faster than Flux, works well even on regular laptops and holds its own when paired with LoRAs. One user mixed Turbo with 3 LoRAs and got solid results in 10 steps.
While it's smaller than Flux (2B vs 12B parameters), some say it compares well to fine-tuned SDXL models and is easier to train for certain use cases, especially style-based stuff. Others praise it for upscaling and image correction at lower noise levels.
But it’s not perfect. Prompt adherence is hit or miss. Faces can look odd. Hands? Even worse. A few folks say it lacks proper training and needs better finetunes to really shine. There's also debate over its potential vs Flux. Some think Flux got better community backing early on while 3.5 never got that same push.
There’s still solid interest in SD 3.5 Medium for fast rendering and unique styling. Especially when fine-tuned right. If you're low on resources but want quality results it might be your sweet spot.
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Useful Links
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This page was last updated on June 13, 2025 at 8:18 PM