This Qwen3.5-9B model was quantized with NVFP4 with MTP support, using my soon to be released NVFP4 GGUF quantizer. This autotunes the model to reduce ppl and kld as much as possible, and selects an optimal llama.cpp tensor distribution.

This keeps the model size down to just 5.66GB (previously 6.21GB) while still improving quality, and MTP increases speed.

Updated results with better ppl/kld distribution:

====== Perplexity statistics ======
Mean PPL(Q)                   :   8.252679 ±   0.055494
Mean PPL(base)                :   8.184061 ±   0.055382
Cor(ln(PPL(Q)), ln(PPL(base))):  98.68%
Mean ln(PPL(Q)/PPL(base))     :   0.008349 ±   0.001098
Mean PPL(Q)/PPL(base)         :   1.008384 ±   0.001108
Mean PPL(Q)-PPL(base)         :   0.068618 ±   0.009021

====== KL divergence statistics ======
Mean    KLD:   0.061969 ±   0.000836
Maximum KLD:  25.706320
99.9%   KLD:   3.060981
99.0%   KLD:   0.504558
95.0%   KLD:   0.178821
90.0%   KLD:   0.113534
Median  KLD:   0.027535
10.0%   KLD:   0.001330
 5.0%   KLD:   0.000385
 1.0%   KLD:   0.000052
 0.1%   KLD:   0.000007
Minimum KLD:  -0.000136

====== Token probability statistics ======
Mean    Δp: -0.496 ± 0.017 %
Maximum Δp: 99.953%
99.9%   Δp: 49.024%
99.0%   Δp: 16.581%
95.0%   Δp:  7.308%
90.0%   Δp:  4.173%
75.0%   Δp:  0.814%
Median  Δp: -0.013%
25.0%   Δp: -1.507%
10.0%   Δp: -5.672%
 5.0%   Δp: -9.537%
 1.0%   Δp: -21.667%
 0.1%   Δp: -51.141%
Minimum Δp: -99.820%
RMS Δp    :  6.656 ± 0.056 %
Same top p: 89.216 ± 0.081 %
Top flip weight:   0.009668
Top prob RMSE  :   0.080021
Entropy RMSE   :   0.272950

Previous results of this model (older quantizer):

====== Perplexity statistics ======
Mean PPL(Q)                   :   8.511450 ±   0.057807
Mean PPL(base)                :   8.184061 ±   0.055382
Cor(ln(PPL(Q)), ln(PPL(base))):  98.30%
Mean ln(PPL(Q)/PPL(base))     :   0.039224 ±   0.001251
Mean PPL(Q)/PPL(base)         :   1.040003 ±   0.001301
Mean PPL(Q)-PPL(base)         :   0.327389 ±   0.010714

====== KL divergence statistics ======
Mean    KLD:   0.082267 ±   0.000935
Maximum KLD:  26.195276
99.9%   KLD:   3.699525
99.0%   KLD:   0.655555
95.0%   KLD:   0.239608
90.0%   KLD:   0.155213
Median  KLD:   0.038994
10.0%   KLD:   0.001889
 5.0%   KLD:   0.000544
 1.0%   KLD:   0.000079
 0.1%   KLD:   0.000011
Minimum KLD:  -0.000016

====== Token probability statistics ======
Mean    Δp: -0.911 ± 0.020 %
Maximum Δp: 99.991%
99.9%   Δp: 50.329%
99.0%   Δp: 17.867%
95.0%   Δp:  8.117%
90.0%   Δp:  4.473%
75.0%   Δp:  0.746%
Median  Δp: -0.044%
25.0%   Δp: -2.061%
10.0%   Δp: -7.160%
 5.0%   Δp: -11.774%
 1.0%   Δp: -27.189%
 0.1%   Δp: -62.353%
Minimum Δp: -99.881%
RMS Δp    :  7.690 ± 0.057 %
Same top p: 87.429 ± 0.086 %

Compare the original Qwen3.5-9B-NVFP4(made via ModelOpt):

====== Perplexity statistics ======
Mean PPL(Q)                   :   8.676226 ±   0.059423
Mean PPL(base)                :   8.184061 ±   0.055382
Cor(ln(PPL(Q)), ln(PPL(base))):  98.30%
Mean ln(PPL(Q)/PPL(base))     :   0.058398 ±   0.001259
Mean PPL(Q)/PPL(base)         :   1.060137 ±   0.001334
Mean PPL(Q)-PPL(base)         :   0.492165 ±   0.011330

====== KL divergence statistics ======
Mean    KLD:   0.085222 ±   0.000895
Maximum KLD:  27.925140
99.9%   KLD:   3.518223
99.0%   KLD:   0.672682
95.0%   KLD:   0.250890
90.0%   KLD:   0.164238
Median  KLD:   0.042011
10.0%   KLD:   0.001942
 5.0%   KLD:   0.000554
 1.0%   KLD:   0.000077
 0.1%   KLD:   0.000011
Minimum KLD:  -0.000043

====== Token probability statistics ======
Mean    Δp: -0.996 ± 0.020 %
Maximum Δp: 99.998%
99.9%   Δp: 48.766%
99.0%   Δp: 18.332%
95.0%   Δp:  8.174%
90.0%   Δp:  4.538%
75.0%   Δp:  0.727%
Median  Δp: -0.053%
25.0%   Δp: -2.165%
10.0%   Δp: -7.505%
 5.0%   Δp: -12.305%
 1.0%   Δp: -27.862%
 0.1%   Δp: -63.063%
Minimum Δp: -99.966%
RMS Δp    :  7.856 ± 0.056 %
Same top p: 87.312 ± 0.087 %
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