Stable Diffusion 3.5 Large

Hugging Face·Jul 23, 2026

Bringing Nunchaku 4-bit Diffusion Inference to Diffusers

The Nunchaku 4-bit diffusion inference technique was integrated into the Hugging Face Diffusers library on March 18, 2024. This integration allows for significantly faster and more memory-efficient generation of AI images by reducing the precision of model weights from 16-bit floating point to 4-bit integers. The Nunchaku method employs techniques such as quantization-aware training and optimized dequantization to maintain image quality while achieving substantial performance gains. This advancement is particularly beneficial for users with limited hardware resources, such as those running AI models on consumer-grade GPUs or even CPUs. By lowering the memory footprint of diffusion models, Nunchaku makes advanced image generation more accessible. The Hugging Face Diffusers library is a widely used open-source platform for working with diffusion models, and the addition of Nunchaku is expected to accelerate research and development in the field of generative AI image synthesis. Early benchmarks indicate that Nunchaku can achieve inference speeds up to 2x faster than standard 16-bit inference, with a memory reduction of over 75% in some cases. The implementation within Diffusers provides a straightforward API for developers to leverage Nunchaku without requiring deep expertise in quantization methods. Users can now load pre-trained diffusion models and apply the 4-bit inference with minimal code changes. This move aligns with the broader trend in the AI community towards developing more efficient models that can run on a wider range of hardware, democratizing access to powerful AI capabilities. The Nunchaku project was initially developed by researchers at Stability AI and has now been contributed to the open-source community through Hugging Face.