SpectralQuant Qwen3.5 0.8B Q4_K_M recovers 96.5% of BF16 gap
Spectral Labs has released a release candidate for a calibration-aware Q4_K_M quantization of the Qwen3.5 0.8B model, utilizing a new method called SpectralQuant. This approach aims to make standard Q4_K_M footprints behave more like larger quant formats while maintaining compatibility with llama.cpp.