Model reference · open weights
Sulphur-2 is an open-weight video model from SulphurAI, listed in the AxForge catalogue. AxForge can bring it up on EU-owned hardware for you on request — with the licence handled where one is required.
About
Sulphur 2 An uncensored video generation model based on LTX 2.3 supporting both t2v and i2v natively, as well as all of the other ltx 2.3 formats. Follow us on X Join our Discord Support the next version of the project, even just a few dollars would go a long way: Kofi As a note, official inference for the model is coming soon. Get Started: To get started with the model, I recommend downloading either of the dev versions, (fp8mixed or bf16) and downloading the distill lora provided. By the way, I'm aware the workflows contain sulphurfinal right now, just use the lora or use the full models, don't use both at the same time. This model contains a prompt enhancer. The easiest way to get started with the prompt enhancer is by using it on lmstudio. The way to accomplish this is by going to your model folder inside lmstudio, then opening it up in your file explorer. Create a folder named "Sulphur", then a folder inside that called "promptenhancer". Inside that folder, place the gguf file and the mmproj file. Once you've done that, you should be able to load the prompt enhancer in lmstudio. There is no system prompt for it, just send the text (and an image) you'd like to be enhanced. As a note, this readme will contain better setup instructions and how to train on top of the model soon. Links - (CivitAI Base Model) - - (CivitAI Quant Model) - Credits - (TenStrip) — Testing & model merging (His i2v merge of sulphur 2, highly recommend for i2v) - @s1lv3rc01n — Testing & model merging/quantizing (silveroxides) - @mov7162 — Musubi Tuner guidance - And many others, if you'd like to be on the credits and I didn't place you here, message me I likely assumed you didn't want to be here. Funders - Anonymous funder #1 — Supported the original Sulphur - Anonymous funder #2 — Made Sulphur 2 possible; this model wouldn't exist without them Thank you to everyone who contributed.
Summarised from the published model card. Read the full card on the HuggingFace links below.
Specifications
| Maker | SulphurAI |
|---|---|
| Type | Video models |
| Variants | 1 |
| Runs with | diffusers |
| Based on | Lightricks/LTX-2.3 |
| Released | 2026-05-03 |
| Popularity | 212k downloads / month |
| Likes | 2,027 |
| Licence | Commercial licence needed |
How it works
Variants
Open weights ship in several sizes and precisions. One page, all the variants — pick the one that fits your GPU. VRAM figures are estimates from model size.
| Variant | Params | Precision | VRAM | Fits 16 GB | Weights |
|---|---|---|---|---|---|
| Sulphur-2-base | — | BF16 | — | — | Weights ↗ |
Using it via the API
Once AxForge deploys sulphur-2 for you, it answers on the OpenAI-compatible API — the same base URL and keys as every other model. (sulphur-2 below is illustrative; you get the exact model name on deployment.)
$ curl -sS https://api.axforge.ai/v1/videos/generations \
-H "Authorization: Bearer $AXFORGE_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"sulphur-2","prompt":"a drone shot over a forest"}'
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Licence
The weights are open but its licence needs a commercial agreement for business use. AxForge can arrange that licence and host the model for you — you pay AxForge, we settle with the model’s maker. Ask us for a quote. Read the licence ↗
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