Qwen3.8-27B-BaseQuant-V1

Quantized builds of Qwen/Qwen3.8-27B in five sizes. On held-out text, each one is closer to the BF16 model than the unsloth dynamic quant of the same size.

Size GGUF (llama.cpp) baseRT bundle Same size as
XS Qwen3.8-27B-BaseQuant-V1-XS.gguf (8.36 GB) Qwen3.8-27B-BaseQuant-V1-XS.base unsloth UD-IQ2_S (8.37 GB)
Small Qwen3.8-27B-BaseQuant-V1-Small.gguf (10.93 GB) Qwen3.8-27B-BaseQuant-V1-Small.base unsloth UD-IQ3_XXS (10.93 GB)
Medium Qwen3.8-27B-BaseQuant-V1-Medium.gguf (16.41 GB) Qwen3.8-27B-BaseQuant-V1-Medium.base unsloth UD-Q4_K_M (16.46 GB)
Large Qwen3.8-27B-BaseQuant-V1-Large.gguf (20.82 GB) Qwen3.8-27B-BaseQuant-V1-Large.base unsloth UD-Q5_K_XL (20.88 GB)
XL Qwen3.8-27B-BaseQuant-V1-XL.gguf (25.30 GB) Qwen3.8-27B-BaseQuant-V1-XL.base unsloth UD-Q6_K_XL (25.30 GB)

Each GGUF is no larger than its unsloth counterpart. The Small bundle needs baseRT 0.4.0 or later. The XS files are text-only and have no MTP layer, like unsloth's UD-IQ2_S; the XS bundle was tested on baseRT 0.4.1.

The XL GGUF keeps the MTP layer, like UD-Q6_K_XL. baseRT does not load Q8_0, so the XL bundle stores those tensors in baseRT's own 8-bit format at the same 8.5 bits per weight. The bundle carries the MTP head for --speculate mtp-head, and was tested with baseRT 0.4.1 and superfluid 0.1.4.

Usage

# llama.cpp
llama-server -hf basecompute/Qwen3.8-27B-BaseQuant-V1 -hff Qwen3.8-27B-BaseQuant-V1-Medium.gguf -c 32768 -ngl 99


# SuperFluid
curl -fsSL https://superfluid.sh/install.sh | sh
superfluid serve basecompute/Qwen3.8-27B-BaseQuant-V1 --runtime basert --pull-file Qwen3.8-27B-BaseQuant-V1-Medium.base

# baseRT
hf download basecompute/Qwen3.8-27B-BaseQuant-V1 Qwen3.8-27B-BaseQuant-V1-Large.base --local-dir .
basert serve ./Qwen3.8-27B-BaseQuant-V1-Large.base

Results

KL divergence of each quant's next-token distribution from the BF16 model, ours beside unsloth's quant of the same size, measured in llama.cpp. Lower is closer to BF16. The percentage over each pair is our change against unsloth.

Held-out text

On text that was not used to build these files, Small, Medium and Large are 17–34% closer to BF16 than unsloth's quant of the same size, XS is 12–15% closer and XL is 30–37% closer. The plots cover Small, Medium and Large.

Held-out KL divergence, BaseQuant and unsloth

Held-out text XS vs UD-IQ2_S Small vs UD-IQ3_XXS Medium vs UD-Q4_K_M Large vs UD-Q5_K_XL XL vs UD-Q6_K_XL
Model's own continuations 0.0914 / 0.0776 (-15%) 0.0391 / 0.0308 (-21%) 0.00713 / 0.00555 (-22%) 0.00278 / 0.00200 (-28%) 0.00126 / 0.00089 (-30%)
Written text 0.8349 / 0.7308 (-12%) 0.5288 / 0.4318 (-18%) 0.2081 / 0.1579 (-24%) 0.1080 / 0.0716 (-34%) 0.0886 / 0.0558 (-37%)
Tool-call turns not measured 0.0631 / 0.0526 (-17%) 0.0127 / 0.0099 (-22%) 0.00496 / 0.00354 (-29%) not measured
Tool calls + final answers not measured 0.0631 / 0.0523 (-17%) 0.0112 / 0.0090 (-20%) 0.00432 / 0.00320 (-26%) not measured

Each cell: unsloth KL / BaseQuant KL (change). Bold marks the lower KL.

Public prompts

The prompts come from six public datasets (OpenHands, SWE-agent, Glaive function calling, OpenOrca, Tulu 3, OpenHermes). The BF16 model writes each continuation (thinking on), and both quants are scored along it.

On-policy KL divergence on public prompts, BaseQuant and unsloth

Source XS vs UD-IQ2_S Small vs UD-IQ3_XXS Medium vs UD-Q4_K_M Large vs UD-Q5_K_XL XL vs UD-Q6_K_XL
OpenHands 0.1831 / 0.1284 (-30%) 0.1190 / 0.0793 (-33%) 0.0212 / 0.0182 (-14%) 0.00450 / 0.00447 (-1%) 0.00219 / 0.00118 (-46%)
SWE-agent 0.1006 / 0.0955 (-5%) 0.0449 / 0.0330 (-27%) 0.00912 / 0.00708 (-22%) 0.00293 / 0.00241 (-18%) 0.00118 / 0.00102 (-14%)
Glaive function calling 0.1825 / 0.1652 (-9%) 0.0673 / 0.0628 (-7%) 0.0112 / 0.0098 (-13%) 0.00335 / 0.00325 (-3%) 0.00128 / 0.00102 (-20%)
OpenOrca 0.1431 / 0.1174 (-18%) 0.0515 / 0.0431 (-16%) 0.00759 / 0.00624 (-18%) 0.00248 / 0.00231 (-7%) 0.000969 / 0.000861 (-11%)
Tulu 3 0.1404 / 0.1182 (-16%) 0.0470 / 0.0402 (-14%) 0.00730 / 0.00585 (-20%) 0.00238 / 0.00231 (-3%) 0.000992 / 0.000863 (-13%)
OpenHermes 0.1277 / 0.1183 (-7%) 0.0445 / 0.0420 (-6%) 0.00639 / 0.00613 (-4%) 0.00203 / 0.00209 (+3%) 0.000761 / 0.000702 (-8%)
All six 0.1441 / 0.1242 (-14%) 0.0539 / 0.0460 (-15%) 0.00861 / 0.00731 (-15%) 0.00262 / 0.00253 (-3%) 0.00106 / 0.000880 (-17%)

Each cell: unsloth KL / BaseQuant KL (change). Bold marks the lower KL.

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