GLM-5.3-Flash quantizes to 4-bit with 93% accuracy retained

GLM-5.3-Flash (ox-alpha) can be quantized to 4-bit while retaining 93% accuracy, according to Daniel Han. The post says the 4-bit model runs on a 256GB Mac or two DGX Sparks, and 5-bit may also work. Unsloth separately says 3-bit GGUF runs on 128GB RAM and that the model rivals Claude Opus 4.8 on DeepSWE, coding, and agentic benchmarks.