GLM-5.3
Imatrix quants best-in-class for ik_llama.cpp
NOTE: ik_llama.cpp is highly versatile and runs mainline llama.cpp quants such as existing GGUFs from bartowski, unsloth, mradermacher, Aes Sedai etc
IQ2_K done! โœ… IQ3_K done! โœ… IQ4_K done! โœ…. All quants done unless someone really wants a Q1. See the collection below.
General Specs
Value
ArchitectureGLM-DSA (MoE, 256 experts ร— 22B, 8 active)
Params744B total / 40B active
Context1,048,576
Basezai-org/GLM-5.3-BF16
ImatrixAes Sedai โ€” converted for ik_llama.cpp
Calibrationcalibration_datav5.txt
PPL Analysis
Relative PPL vs Model Size
Quant Collection
โœ… IQ4_K  4.581 BPW ยท 401.77 GiB
Evaluated on wiki.test.raw, 512 ctx, 565 chunks, against BF16 reference logits.
Why the specific layer targeting? (Analysis notes)
Rather than relying solely on conventional depth-based heuristics, the quantization targets were selected using imatrix activation-energy analysis and residuals after detrending for the model's natural increase in activation energy with depth.

The analysis identified blk.3โ€“11 and blk.76โ€“77 as unusually low-energy relative to their expected depth, making them candidates for more aggressive iq4_ks quantization. This is intentionally non-conventional. Since the measured sensitivity profile for these layers was weaker than expected.

In contrast, the mid-depth MoE layers, particularly around blk.29โ€“40, show substantially higher residual energy and were retained at iq4_k. The expert down projections were also treated more conservatively because they feed directly back into the residual stream.

Detrended layer ranking (down output energy):
Trend slope: d(log E)/d(layer) = 0.1545. Residual = actual/trend; lower residual โ‡’ weaker than depth predicts.

blk.3 resid=0.016 up_flow=2.331e+06 blk.4 resid=0.075 up_flow=3.914e+06 blk.5 resid=0.110 up_flow=4.457e+06 blk.6 resid=0.209 up_flow=7.723e+06 blk.7 resid=0.289 up_flow=1.349e+07 blk.76 resid=0.292 up_flow=5.089e+09 blk.10 resid=0.325 up_flow=2.200e+07 blk.9 resid=0.349 up_flow=2.073e+07 blk.77 resid=0.350 up_flow=2.786e+09 blk.11 resid=0.355 up_flow=2.457e+07 blk.75 resid=0.364 up_flow=6.132e+09 blk.67 resid=0.377 up_flow=4.028e+09 ... blk.36 resid=4.166 up_flow=9.199e+08 blk.32 resid=4.225 up_flow=6.227e+08 blk.34 resid=4.276 up_flow=7.851e+08 blk.33 resid=4.401 up_flow=7.199e+08 blk.35 resid=4.430 up_flow=8.652e+08

The resulting recipe is therefore sensitivity-guided rather than position-guided: quantize the measured low-sensitivity outliers slightly more, while preserving precision through the high-energy middle of the network.
MetricValue
PPL (quant)2.707673 ยฑ 0.014047
PPL (BF16 ref)2.674315 ยฑ 0.013811
(PPL(Q)/PPL(base)) - 1+1.2473% ยฑ 0.0963%
KLD0.041196 ยฑ 0.000334
Same top-p93.941 ยฑ 0.063 %
ฮ”p RMS7.839 ยฑ 0.052 %
Quantization recipe
# Attention blk\..*\.attn_k_b\.weight=q8_0 blk\..*\.attn_v_b\.weight=q8_0 blk\..*\.attn_kv_a_mqa\.weight=q8_0 blk\..*\.attn_q_a\.weight=q8_0 blk\..*\.attn_q_b\.weight=q8_0 blk\..*\.attn_output\.weight=q8_0

# Router blk\..*\.ffn_gate_inp\.weight=f32

# First 3 Dense Layers blk\..*\.ffn_down\.weight=iq6_k blk\..*\.ffn_(gate|up)\.weight=iq5_ks

# Shared Expert Layers blk\..*\.ffn_down_shexp\.weight=iq6_k blk\..*\.ffn_(gate|up)_shexp\.weight=iq6_k

# Routed Experts blk\.(78)\.ffn_down_exps\.weight=q6_K blk\.(78)\.ffn_(gate|up)_exps\.weight=q6_K blk\.(3|4|5|6|7|8|9|10|11|76|77)\.ffn_down_exps\.weight=iq4_ks blk\.(3|4|5|6|7|8|9|10|11|76|77)\.ffn_(gate|up)_exps\.weight=iq4_ks blk\..*\.ffn_down_exps\.weight=iq4_k blk\..*\.ffn_(gate|up)_exps\.weight=iq4_k

# Indexer blk\..*\.indexer\.attn_q_b\.weight=q6_K blk\..*\.indexer\.attn_k\.weight=q8_0 blk\..*\.indexer\.proj\.weight=q8_0 blk\..*\.indexer\.k_norm\.(weight|bias)=f32

# MTP block - eh_proj is the throughput-critical tensor per ik's finding blk\..*\.nextn\.eh_proj\.weight=q4_0 blk\..*\.nextn\.enorm\.weight=f32 blk\..*\.nextn\.hnorm\.weight=f32 blk\..*\.nextn\.shared_head_norm\.weight=f32

token_embd\.weight=iq6_k output\.weight=iq6_k

โœ… IQ3_K  3.670 BPW ยท 321.83 GiB
Evaluated on wiki.test.raw, 512 ctx, 565 chunks, against BF16 reference logits.
MetricValue
PPL (quant)2.820603 ยฑ 0.014842
PPL (BF16 ref)2.674315 ยฑ 0.013811
(PPL(Q)/PPL(base)) - 1+5.4701% ยฑ 0.1627%
KLD0.108800 ยฑ 0.000809
Same top-p90.352 ยฑ 0.078 %
ฮ”p RMS12.780 ยฑ 0.070 %
Quantization recipe
# Attention blk\..*\.attn_k_b\.weight=q8_0 blk\..*\.attn_v_b\.weight=q8_0 blk\..*\.attn_kv_a_mqa\.weight=q8_0 blk\..*\.attn_q_a\.weight=iq6_k blk\..*\.attn_q_b\.weight=iq6_k blk\..*\.attn_output\.weight=iq6_k

# Router blk\..*\.ffn_gate_inp\.weight=f32

# First 3 Dense Layers blk\..*\.ffn_down\.weight=iq6_k blk\..*\.ffn_(gate|up)\.weight=iq5_ks

# Shared Expert Layers blk\..*\.ffn_down_shexp\.weight=iq6_k blk\..*\.ffn_(gate|up)_shexp\.weight=iq6_k

# Routed Experts blk\.(78)\.ffn_down_exps\.weight=q6_K blk\.(78)\.ffn_(gate|up)_exps\.weight=q6_K blk\..*\.ffn_down_exps\.weight=iq4_ks blk\..*\.ffn_(gate|up)_exps\.weight=iq3_ks

# Indexer blk\..*\.indexer\.k_norm\.(weight|bias)=f32 blk\..*\.indexer\.proj\.weight=q8_0 blk\..*\.indexer\.attn_k\.weight=q8_0 blk\..*\.indexer\.attn_q_b\.weight=q6_K

# MTP block - eh_proj is the throughput-critical tensor per ik's finding blk\..*\.nextn\.eh_proj\.weight=q4_0 blk\..*\.nextn\.enorm\.weight=f32 blk\..*\.nextn\.hnorm\.weight=f32 blk\..*\.nextn\.shared_head_norm\.weight=f32

token_embd\.weight=iq5_k output\.weight=iq6_k

โœ… IQ2_K  2.695 BPW ยท 236.39 GiB
The Q2 to run on 256 GiB systems. Tight 256 GiB-friendly footprint at 2.695 BPW. GGUF upload in progress โ€” see status above.
Evaluated on wiki.test.raw, 512 ctx, 565 chunks, against BF16 reference logits.
MetricValue
PPL (quant)3.436789 ยฑ 0.018731
PPL (BF16 ref)2.674315 ยฑ 0.013811
(PPL(Q)/PPL(base)) - 1+28.511% ยฑ 0.3730%
KLD0.381602 ยฑ 0.002102
Same top-p80.498 ยฑ 0.104 %
ฮ”p RMS24.399 ยฑ 0.087 %
Quantization recipe
# Attention blk\..*\.attn_k_b\.weight=q8_0 blk\..*\.attn_v_b\.weight=q8_0 blk\..*\.attn_kv_a_mqa\.weight=q8_0 blk\..*\.attn_q_a\.weight=q8_0 blk\..*\.attn_q_b\.weight=q8_0 blk\..*\.attn_output\.weight=iq6_k

# Router blk\..*\.ffn_gate_inp\.weight=f32

# First 3 Dense Layers blk\..*\.ffn_down\.weight=iq6_k blk\..*\.ffn_(gate|up)\.weight=iq5_ks

# Shared Expert Layers blk\..*\.ffn_down_shexp\.weight=iq6_k blk\..*\.ffn_(gate|up)_shexp\.weight=iq6_k

# Routed Experts blk\.(78)\.ffn_down_exps\.weight=q6_K blk\.(78)\.ffn_(gate|up)_exps\.weight=q6_K blk\..*\.ffn_down_exps\.weight=iq3_ks blk\..*\.ffn_(gate|up)_exps\.weight=iq2_ks

# Indexer blk\..*\.indexer\.attn_q_b\.weight=q6_K blk\..*\.indexer\.attn_k\.weight=q8_0 blk\..*\.indexer\.proj\.weight=q8_0 blk\..*\.indexer\.k_norm\.(weight|bias)=f32

# MTP block - eh_proj is the throughput-critical tensor per ik's finding blk\..*\.nextn\.eh_proj\.weight=q4_0 blk\..*\.nextn\.enorm\.weight=f32 blk\..*\.nextn\.hnorm\.weight=f32 blk\..*\.nextn\.shared_head_norm\.weight=f32

token_embd\.weight=iq6_k output\.weight=iq6_k

Quick Start
Requires ik_llama.cpp. Standard llama.cpp will not run these quants.

# Clone and build git clone https://github.com/ikawrakow/ik_llama.cpp cd ik_llama.cpp cmake -B build -DCMAKE_BUILD_TYPE=Release -DGGML_CUDA=ON cmake --build build --config Release -j $(nproc)

# Download pip install huggingface_hub hf download L-Alchemyst/GLM-5.3-GGUF --repo-type model --include "IQ3_K/*" --local-dir ./glm5.3-iq3k

# Hybrid CPU+GPU โ€” adjust --n-cpu-moe and -cram to your RAM ./build/bin/llama-server
--model GLM-5.3-IQ3_K.gguf
-muge --merge-qkv
--ctx-size 131072
-ctk f16 -mla 3 -amb 1536
-ngl 999
--n-cpu-moe 50
--parallel 1
--threads 96 --threads-batch 128
--host 127.0.0.1 --port 8080
--no-mmap
-cram 8192
--jinja

CPU-only: use -ctk q8_0 and prefix with numactl -N ${SOCKET} -m ${SOCKET}.
Credits
Imatrix & reference logits: Aes Sedai
Base model: zai-org/GLM-5.3-BF16
Runtime: ik_llama.cpp
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