A while ago Stability.ai released a new model on a different architecture, that seems to provide very promising results and very fast training: Stable Cascade. I really wished to offer it on the AI Horde so after getting explicit permission from Emad in Reddit PMs (due to its more restrictive license for APIs), I set out to implement it.
Unfortunately the Stable Cascade model and ComfyUI workflow require the use of two different checkpoints, which went against the AI Horde worker paradigm at the time, which expected one file per model, so I had to make multiple changes in a lot of packages which expected this paradigm. The Worker, hordelib, the model reference and its SDK, all of them required tweaking to avoid crashing.
Fortunately, while the changes were complicated, I managed to implement them without much debugging. I did initially run into some troubles with the image quality being garbage, which turned out required ComfyAnon tweaking the implementation on ComfyUI a bit, but once that was done, everything fell in place and now you can use the AI Horde to request Stable Cascade images and therefore check the capability of this model, even if you don’t have 20G VRAM to spare.
You can try it out on Artbot
Alongside Stable Cascade, I thought it’s high time we start expanding our SDXL model selection, so the following models have also been onboarded.
- Juggernaut XL
- Anime Illust Diffusion XL
- Pony Diffusion XL
- Animagine XL
- DreamShaper XL (Lightning version)
We quickly realized that we also need to expand our model reference to better inform people of the requirements for some of these models. For example Pony Diffusion XL doesn’t work unless you set clip_skip to 2, and DreamShaper requires low steps, cfg and specific samplers. If you know to set those settings correctly, you’ll get amazing images, else you get hot garbage. Soon the horde will be warning you when trying to use a model outside its specifications.
Other than that, we haven’t been completely idle. Some other notable achievements in the previous weeks are:
Firstly, the AI Horde now supports an educator role for accounts. If you are an education institution and you want to use one of the AI Horde free tools for the classroom, you can request your account to be set as an educator, which will force all your requests to be SFW and increase your account’s concurrency.
I also spent some time improving the AI Generation of the Mastodon bot @dungeons, so that it gets nicer images for each campaign protagonist. Will admit I had a lot more fun than I should improving the versatility and variability of the generations and tweaking then results for each model. You can see (or follow) the results in the dedicated account replying with those images.
On the worker side, Tazlin has also been very busy improving the efficiency of our generations. We have added now some improvements such as downloading the loras for the next job, while performing the inference for the previous one, or adding more efficiency for those people with more powerful machines.
I’m now hard at work trying to onboard more Stable Cascade capabilities as they are added to ComfyUI and to add support for more advanced workflow capabilities.