Penjing-27B -- Pollard

Pollard shrank this model: 54.64 GB (f16) -> 6.53 GB -- 88% smaller, 8.4x down.

The smallest rung here; larger, higher-fidelity rungs are listed below.

format this model's size

f16 54.64 GB

Q8_0 ~28.96 GB

Q6_K 22.43 GB

Q4_K_M ~15.85 GB

PollardMix (this repo's IQ1_KT) 6.53 GB

format	this model's size
f16	54.64 GB
Q8_0	~28.96 GB
Q6_K	22.43 GB
Q4_K_M	~15.85 GB
PollardMix (this repo's IQ1_KT)	6.53 GB

Pollard builds of Qwen/Qwen3.8-27B made with Pollard Weights -- a ladder of measured-allocation quants (bits placed by per-layer sensitivity, not a uniform crush).

Standard GGUF -- runs in stock llama.cpp / ik_llama.cpp, Ollama, LM Studio, except where noted. IQ2_KT, IQ1_KT need ik_llama.cpp: their allocation puts ik_llama-only atoms on the tensors it protects. The rest run anywhere.

Model details


Parameter count	~27.3B
Architecture	`qwen3_5`
Input support	text, image
imatrix	yes -- see calibration
Perplexity measured	yes -- table below

Which file should I choose?

Every rung is the same weights, sized to a different RAM budget by the measured allocation. Pick the largest one that fits your machine with room for context:

~24.4 GB RAM / VRAM -> Q6_K (22.43 GB).
~17.5 GB RAM / VRAM -> IQ4_XS (15.47 GB).
~14.9 GB RAM / VRAM -> IQ3_S (12.94 GB).
~9.4 GB RAM / VRAM -> IQ2_KT (7.36 GB). (ik_llama.cpp)
~9.2 GB RAM / VRAM -> IQ2_XXS (7.25 GB).
~8.5 GB RAM / VRAM -> IQ1_KT (6.53 GB). (ik_llama.cpp)

Available files (wikitext2 test, -c 2048)

f16 reference PPL 4.1422.

file	PPL	size	Mean KLD	Top-1 agree	runs in	notes
`Penjing-27B-IQ1_KT.gguf`	5.7864	6.53 GB	0.5513	75.88%	ik_llama	smallest -- +40% vs f16
`Penjing-27B-IQ2_XXS.gguf`	5.4312	7.25 GB	0.5142	76.38%	any llama.cpp	+31% vs f16
`Penjing-27B-IQ2_KT.gguf`	5.0817	7.36 GB	0.4217	79.10%	ik_llama	recommended default -- +23% vs f16
`Penjing-27B-IQ3_S.gguf`	--	12.94 GB	--	--	any llama.cpp
`Penjing-27B-IQ4_XS.gguf`	--	15.47 GB	--	--	any llama.cpp
`Penjing-27B-Q6_K.gguf`	--	22.43 GB	--	--	any llama.cpp	largest

Top-1 agree = share of tokens where the rung's most-likely token is the same one the f16 would have picked (llama-perplexity's Same top p). Higher is closer to the original model.

Multimodal

Vision needs the projector shipped alongside: mmproj-Penjing-27B-bf16.gguf -- download it too and pass it with --mmproj. It is not quantized; it is small and the text ladder is where the size lives.

llama-server -m Penjing-27B-IQ1_KT.gguf --mmproj mmproj-Penjing-27B-bf16.gguf -ngl 99

Download a specific file

pip install -U "huggingface_hub[cli]"
hf download PollardWeights/Penjing-27B-Pollard \
  --include "Penjing-27B-IQ1_KT.gguf" --local-dir ./

How to run

IQ1_KT is built on ik_llama-only atoms, so it runs with ik_llama.cpp:

llama-cli    -m Penjing-27B-IQ1_KT.gguf -ngl 99 -p "Explain why the sky is blue."
llama-server -m Penjing-27B-IQ1_KT.gguf -ngl 99

For stock llama.cpp, Ollama or LM Studio, use Q6_K instead:

llama-server -hf PollardWeights/Penjing-27B-Pollard:Q6_K
llama-cli    -m Penjing-27B-Q6_K.gguf -ngl 99 -p "Explain why the sky is blue."

imatrix (calibration)

The importance matrix (Qwen__Qwen3.8-27B.dat, included) was computed on a mixed-domain corpus so the matrix sees every register the model serves.

ARM / AVX

llama.cpp repacks weights into an interleaved layout at load time for faster inference on ARM and AVX machines -- no special file needed, online repacking covers these quants. The old Q4_0_4_4/4_8/8_8 variants are not required.

Errata

IQ2_KT, IQ1_KT carry ik_llama-only atoms and need ik_llama.cpp to run; stock llama.cpp rejects any ggml type above 42 outright. Checked with pollard-ggufcheck, from the files' tensor types rather than their names.
Measured allocation places bits by per-layer sensitivity under a size budget.
Single machine; replication invited.

Credits & license

Base model: Qwen/Qwen3.8-27B
Quantization tooling: llama.cpp (ggml-org)
Method + tooling: Pollard Weights -- measure first, no claim before a number.
License: apache-2.0, inherited from the base model.

Built with Pollard Weights -- frontier models, small hardware, no compromise.

PollardWeights/Penjing-27B-Pollard