Qwen3.8 27B quantizations benchmarked: 4-bit holds up, 1-bit collapses
Q4_K_M quantization of Qwen3.8 27B matches the full BF16 model on Terminal-Bench 2.1 while fitting in 17 GB, but 1-bit performs near random chance on GPQA Diamond. Benchmarks cost about $3,000 on Modal GPUs.
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