QuantFunc/Nunchaku-Qwen-Image-2512

License & Attribution

These are quantized derivative weights of Qwen/Qwen-Image-2512 (Qwen-Image-2512).

• Modifications: the original weights were quantized (e.g. W4A4 / FP4 / INT4 / FP8) and repackaged for the QuantFunc inference engine — a "modification" under Apache-2.0 §4(b).
• License: Apache License 2.0 (inherited from the base model), included as LICENSE. Upstream copyright and attribution notices are retained.
• This repository is not affiliated with or endorsed by the upstream model authors.

Disclaimer: "Nunchaku" / "SVDQuant" name the quantization method/format (the open-source SVDQuant work by MIT HAN Lab, Apache-2.0). This repository is an independent re-quantization and is not affiliated with, sponsored by, or endorsed by MIT HAN Lab or the Nunchaku project. Official Nunchaku releases are under the nunchaku-ai / nunchaku-tech namespaces.

QuantFunc

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⚡ Qwen-Image-2512 — SVDQ (Nunchaku) pre-quantized text-to-image. 2x–11x faster with the QuantFunc plugin; 100% Nunchaku-ComfyUI compatible.

Offline-quantized Qwen-Image-2512 text-to-image checkpoints in best-quality / balanced / ultimate-speed variants (INT4 & FP4), ready to drop straight into ComfyUI.

Powered by the QuantFunc ComfyUI plugin — the fastest diffusion inference engine:

• 🚀 2x–11x speedup over standard BF16/FP16 Python pipelines (pre-exported → even faster loading).
• ⚙️ Native C++/CUDA (libquantfunc.so / quantfunc.dll) with zero Python model dependencies.
• 🧩 Dual engine (SVDQ offline + Lighting runtime 4-bit), zero-cost LoRA stacking, reference-image editing & inpainting.
• 🟢 Full GPU coverage — RTX 20/30/40/50 · A100/H100/H200/B100/B200/GB300 · RTX 6000 Ada / PRO Blackwell (CUDA 12 & 13); native FP4 on Blackwell.

👉 Install the plugin: https://github.com/RealJonathanYip/ComfyUI-QuantFunc

Introduction

We are excited to share our latest model series based on nunchaku + qwen-image-2512 quantization. These models are carefully optimized to maintain high-quality output while significantly improving inference speed and efficiency. All models are 100% compatible with the nunchaku-comfyui && lora plugin and can be used directly in ComfyUI.

Gallery

Model Checkpoints

Name	low_rank	Notes
nunchaku_qwen_image_2512_best_quality_fp4	256	Best quality model, suitable for scenarios with extremely high quality requirements
nunchaku_qwen_image_2512_best_quality_int4	256	Best quality model, suitable for scenarios with extremely high quality requirements
nunchaku_qwen_image_2512_ultimate_speed_int4	32	Ultimate speed model, prioritizing inference speed
nunchaku_qwen_image_2512_ultimate_speed_fp4	32	Ultimate speed model, prioritizing inference speed
nunchaku_qwen_image_2512_balance_int4	128	Balanced model, achieving the best balance between quality and speed
nunchaku_qwen_image_2512_balance_fp4	128	Balanced model, achieving the best balance between quality and speed

4 steps workflow

Here’s a workflow example of integrating 4-step LoRA in ComfyUI. If you don’t need 4-step LoRA, simply remove the LoRA node.

Coming Soon

If you encounter any issues during use, feel free to join our community for feedback:

• Join our Discord server
• Scan the QR code below to join our WeChat group

We will add support for build in lora and qwen-image-edit-2511 in approximately one month.