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license: creativeml-openrail-m
library_name: diffusers
tags:
- stable-diffusion
- sd-1.5
- hyper-sd
- onnx
- text-to-image
- 4-step
- midjourney-style
base_model: prompthero/openjourney
pipeline_tag: text-to-image
---
# Openjourney + Hyper-SD (4-step) — ONNX
ONNX export of [prompthero/openjourney](https://huggingface.co/prompthero/openjourney) with the [ByteDance/Hyper-SD](https://huggingface.co/ByteDance/Hyper-SD) 4-step LoRA fused into the UNet. SD 1.5 architecture, 512×512 native, Euler scheduler, CFG = 1, **4 steps**.
Openjourney is prompthero's Midjourney-v4-style fine-tune. Activator phrase: `mdjrny-v4 style`. Pick this one when you want the painterly / illustrative "MJ look."
Converted artifact. Training credit: prompthero (Openjourney), ByteDance (Hyper-SD).
## What this repo contains
```
model_index.json
feature_extractor/
scheduler/
text_encoder/
tokenizer/
unet/ # Openjourney UNet + Hyper-SD-15 4-step LoRA fused in
vae_decoder/
vae_encoder/
```
## How it was produced
1. Load `prompthero/openjourney` via `diffusers`.
2. Fuse `ByteDance/Hyper-SD/Hyper-SD15-4steps-lora.safetensors`.
3. `optimum-cli export onnx`.
Toolchain: `optimum 1.24.0`, `diffusers 0.31.0`, `transformers 4.45.2`, `torch 2.4.x` (CUDA 12.4). Conversion script: [`scripts/export-openjourney-hyper.ps1`](https://github.com/HeliosophLLC/DatumIngest/blob/main/scripts/export-openjourney-hyper.ps1).
## Inference notes
| Setting | Value |
|---|---|
| Scheduler | Euler |
| Steps | 4 |
| CFG / guidance scale | 1.0 |
| Negative prompt | Skip |
| Resolution | 512×512 native |
| Activator | Include `mdjrny-v4 style` in prompts |
## License
CreativeML OpenRAIL-M (SD 1.5 + Openjourney + Hyper-SD). License files included. By using this model you accept those terms.
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