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Qwen3.5-397B-A17B REAP35 — Gutenberg Quants

REAP35 expert-pruned (333/512 experts) quantizations of Qwen3.5-397B-A17B using the Gutenberg (Q_K_G) quantization strategy.

Available Quants

Quant Size BPW Mean KLD Same Top Token Description
Q4_K_G 145 GiB ~4.6 0.00729 95.05% Matches Q5_K_M quality at Q4_K_M size
Q3_K_G 117 GiB ~3.8 0.01229 93.93% Matches Q4_K_M quality at 21% less size
IQ2_XS_G 87 GiB ~2.8 0.02922 91.20% Beats Q3_K_M quality at 25% less size
IQ2_XXS_G 81 GiB ~2.6 0.03776 90.20% Beats Q3_K_M quality at 30% less size

KLD measured against Q6_K reference with 32768 context, 10 chunks.

Comparison to Standard Quants

Quant Size Mean KLD Same Top Token
Q5_K_M 173 GiB 0.00713 95.01%
Q4_K_G 145 GiB 0.00729 95.05%
Q4_K_M 148 GiB 0.01290 93.88%
Q3_K_G 117 GiB 0.01229 93.93%
Q3_K_M 116 GiB 0.03793 89.53%
IQ2_XS_G 87 GiB 0.02922 91.20%
Q2_K_M 89 GiB 0.10034 82.73%
IQ2_XXS_G 81 GiB 0.03776 90.20%

Q3_K_G is 3.1x better KLD than Q3_K_M at the same size. Q4_K_G matches Q5_K_M quality while being 28 GiB smaller.

What is the Gutenberg Strategy?

Gutenberg (Q_K_G) is a data-driven quantization method that allocates bit precision based on measured per-tensor KL-divergence sensitivity rather than uniform rules. A sensitivity scan identifies which tensors have the most impact on output quality, and those are preserved at higher precision while the rest are quantized aggressively. Non-expert tensors (attention, shared experts, SSM, embeddings) are kept at Q8_0 as they have disproportionate quality impact relative to their small size.

REAP Expert Pruning

These models use REAP35 pruning — 179 of 512 experts removed per layer (35% pruning) based on imatrix activation scores. This reduces model size while maintaining stable inference. REAP35 is the maximum safe pruning level for this model before quality degradation becomes noticeable.

Compatibility

Fully compatible with stock llama.cpp, llama-server, LM Studio, and any GGUF-compatible runtime. No custom builds required.