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"_meta": {
"note": "single mode: best measured KL that sits fully on the hardware wins; no band caps (if Q8_0 fits, it wins). emergency only when nothing else fits. avoid is never dropped outright: dominance + kl sort handle repo-dependent availability.",
"bands": {
"archival": "near-lossless, take when headroom allows (quality only)",
"avoid": "dominated in size+quality by another quant; only wins when its dominator is absent from the repo",
"default": "rows 5-8 of PRIORITY.md; balanced picks the best-kl fitting one of these",
"emergency": "below the quality knee; picked only when nothing else fits, with a warning",
"knee": "min viable (UD-IQ3_XXS, ~4.4bpw)",
"step": "step up from default when quality is the priority",
"tight": "tight budget, between knee and default"
},
"method": "llama-perplexity --kl-divergence vs family F16/BF16 ref, 6x repeated calibration text (~2500 tokens, ctx 1024, full GPU offload, stock llama.cpp, RTX 5070). norm_kl: 0 = full-precision ref, 1 = family worst. pooled over LFM2.5-1.2B + Qwen3.5-0.8B + gemma-3-1b-it; ranking was consistent across all 3 families. quality = round(100*(1-log10(1+1000*norm_kl)/3)).",
"quality_floor_bpw": 4.5,
"rule_of_thumb": "nothing under ~4.5bpw. default to the default band. avoid band is never the right answer when its dominator is in the same repo.",
"source": "quant-bench: 150 GGUFs, 12 repos, results.csv + PRIORITY.md (2026-10-14)"
},
"quants": [
{
"band": "knee",
"bpw": 4.4,
"n": 2,
"norm_kl": 0.1586,
"q": 27,
"quant": "UD-IQ3_XXS"
},
{
"band": "tight",
"bpw": 4.98,
"n": 3,
"norm_kl": 0.1166,
"q": 31,
"quant": "UD-Q3_K_XL"
},
{
"band": "tight",
"bpw": 5.46,
"n": 4,
"norm_kl": 0.1011,
"q": 33,
"quant": "IQ4_XS"
},
{
"band": "tight",
"bpw": 5.56,
"n": 4,
"norm_kl": 0.0811,
"q": 36,
"quant": "IQ4_NL"
},
{
"band": "default",
"bpw": 5.72,
"n": 3,
"norm_kl": 0.0541,
"q": 42,
"quant": "UD-Q4_K_XL"
},
{
"band": "default",
"bpw": 5.81,
"n": 11,
"norm_kl": 0.0465,
"q": 44,
"quant": "Q4_K_M"
},
{
"band": "default",
"bpw": 6.03,
"n": 2,
"norm_kl": 0.0245,
"q": 53,
"quant": "Q3_K_XL"
},
{
"band": "default",
"bpw": 6.32,
"n": 3,
"norm_kl": 0.0188,
"q": 57,
"quant": "UD-Q5_K_XL"
},
{
"band": "step",
"bpw": 7.03,
"n": 2,
"norm_kl": 0.0118,
"q": 63,
"quant": "Q5_K_L"
},
{
"band": "step",
"bpw": 7.21,
"n": 10,
"norm_kl": 0.0044,
"q": 76,
"quant": "Q6_K"
},
{
"band": "step",
"bpw": 7.65,
"n": 3,
"norm_kl": 0.0032,
"q": 79,
"quant": "UD-Q6_K_XL"
},
{
"band": "step",
"bpw": 7.9,
"n": 2,
"norm_kl": 0.0026,
"q": 81,
"quant": "Q6_K_L"
},
{
"band": "archival",
"bpw": 8.5,
"n": 12,
"norm_kl": 0.0012,
"q": 89,
"quant": "Q8_0"
},
{
"band": "archival",
"bpw": 11.11,
"n": 3,
"norm_kl": 0.0009,
"q": 91,
"quant": "UD-Q8_K_XL"
},
{
"band": "emergency",
"bpw": 4.21,
"n": 2,
"norm_kl": 0.2229,
"q": 22,
"quant": "UD-IQ2_M"
},
{
"band": "emergency",
"bpw": 4.72,
"n": 2,
"norm_kl": 0.3222,
"q": 16,
"quant": "IQ2_M"
},
{
"band": "emergency",
"bpw": 4.91,
"n": 5,
"norm_kl": 0.4585,
"q": 11,
"quant": "Q2_K"
},
{
"band": "emergency",
"bpw": 4.93,
"n": 4,
"norm_kl": 0.4761,
"q": 11,
"quant": "Q2_K_L"
},
{
"band": "emergency",
"bpw": 4.46,
"n": 1,
"norm_kl": 0.5426,
"q": 9,
"quant": "UD-IQ1_M"
},
{
"band": "emergency",
"bpw": 4.44,
"n": 1,
"norm_kl": 0.7422,
"q": 4,
"quant": "UD-IQ1_S"
},
{
"band": "emergency",
"bpw": 3.99,
"n": 2,
"norm_kl": 1.0,
"q": 0,
"quant": "UD-IQ2_XXS"
},
{
"band": "avoid",
"bpw": 6.37,
"n": 7,
"norm_kl": 0.0259,
"q": 52,
"quant": "Q5_K_M"
},
{
"band": "avoid",
"bpw": 6.29,
"n": 6,
"norm_kl": 0.0368,
"q": 47,
"quant": "Q5_K_S"
},
{
"band": "avoid",
"bpw": 6.51,
"n": 2,
"norm_kl": 0.0401,
"q": 46,
"quant": "Q4_K_L"
},
{
"band": "avoid",
"bpw": 5.73,
"n": 6,
"norm_kl": 0.0596,
"q": 41,
"quant": "Q4_K_S"
},
{
"band": "avoid",
"bpw": 5.85,
"n": 4,
"norm_kl": 0.0796,
"q": 36,
"quant": "Q3_K_L"
},
{
"band": "avoid",
"bpw": 5.74,
"n": 5,
"norm_kl": 0.1154,
"q": 31,
"quant": "Q4_1"
},
{
"band": "avoid",
"bpw": 5.39,
"n": 2,
"norm_kl": 0.12,
"q": 31,
"quant": "IQ3_M"
},
{
"band": "avoid",
"bpw": 5.05,
"n": 2,
"norm_kl": 0.1219,
"q": 30,
"quant": "IQ3_XXS"
},
{
"band": "avoid",
"bpw": 5.25,
"n": 6,
"norm_kl": 0.1243,
"q": 30,
"quant": "Q3_K_M"
},
{
"band": "avoid",
"bpw": 5.31,
"n": 2,
"norm_kl": 0.1557,
"q": 27,
"quant": "IQ3_XS"
},
{
"band": "avoid",
"bpw": 5.28,
"n": 8,
"norm_kl": 0.2075,
"q": 23,
"quant": "Q4_0"
},
{
"band": "avoid",
"bpw": 5.0,
"n": 6,
"norm_kl": 0.2849,
"q": 18,
"quant": "Q3_K_S"
},
{
"band": "avoid",
"bpw": 4.37,
"n": 3,
"norm_kl": 0.5345,
"q": 9,
"quant": "UD-Q2_K_XL"
}
]
} |