AtomicChat/qwen36-27b-GGUF

Base model: Qwen/Qwen3.6-27B

Qwen3.6 27B, self-quantized to GGUF by Atomic Chat. Built straight from Qwen's original weights with a per-tensor importance matrix, so this is not a repack of somebody else's files. Runs fully offline.

Highlights

• 27.8B parameters: the weights this repo quantizes.
• Context length: 262,144 tokens (256K), as published by Qwen.
• 64 layers: Dense decoder.
• Modalities: the base model handles Text, Image; this repo ships text-only quants, it carries no vision projector.
• Full imatrix ladder: every quant is calibrated with an importance matrix.
• Agentic Coding:: the model now handles frontend workflows and repository-level reasoning with greater fluency and precision.
• Thinking Preservation:: we've introduced a new option to retain reasoning context from historical messages, streamlining iterative development and reducing overhead.

These GGUFs are self-quantized from the original weights, not a repack. The importance matrix keeps low-bit quants closer to the full-precision model.

Always pass --jinja so the Qwen3.6 27B chat template is applied. Without it the model can emit malformed turns.

Model Overview

Property	Value
Base model	Qwen/Qwen3.6-27B
Parameters	27.8B
Layers	64
Context length	262,144 tokens (256K)
Vocabulary	248,320
Modalities	Text, Image in the base model; text only in this repo, it ships no vision projector
Architecture	Dense decoder, 24 attention heads over 4 KV heads, Qwen3_5ForConditionalGeneration
This repo	GGUF quants (imatrix). Quants: Q2_K, IQ3_M, Q3_K_M, Q3_K_L, IQ4_XS, Q4_K_S, Q4_K_M, UD-Q4_K_XL, Q5_K_S, Q5_K_M, Q6_K, Q8_0

Scores are Qwen's published results for the base Qwen/Qwen3.6-27B, not our own measurements. Quantization preserves the large majority of this; Q4_K_M and up stay close to full precision.

Choosing a quant

Quant	Size	Notes
Q2_K	10.7 GB	Smallest K-quant. Minimal RAM, clear quality drop.
IQ3_M	12.6 GB	Beats Q3 at a similar size thanks to imatrix. Best low-RAM pick.
Q3_K_M	13.3 GB	Low quality but usable.
Q3_K_L	14.3 GB	A step above Q3_K_M.
IQ4_XS	15.1 GB	Excellent quality for size. Recommended low-bit.
Q4_K_S	15.6 GB	Compact 4-bit, fast.
Q4_K_M	16.5 GB	Recommended default. Best balance of size, speed and quality.
UD-Q4_K_XL	17.5 GB	Dynamic. Embeddings and output kept at Q8_0 for higher quality at a Q4 footprint.
Q5_K_S	18.7 GB	Higher quality, slightly more compact than Q5_K_M.
Q5_K_M	19.2 GB	Higher quality, low loss.
Q6_K	22.1 GB	Near lossless, noticeably lighter than Q8_0.
Q8_0	28.6 GB	Effectively lossless, reference quality.

Pick the largest file that fits your (V)RAM with room for context. Q4_K_M or UD-Q4_K_XL is the sweet spot for most setups; Q6_K or Q8_0 for maximum fidelity.

Get started

Run Qwen3.6 27B locally with:

• Atomic Chat: the easiest path. Open the app, search AtomicChat/qwen36-27b-GGUF, pick a quant, hit Use this model.
• llama.cpp: llama-server -hf AtomicChat/qwen36-27b-GGUF:Q4_K_M --jinja -c 8192
• Ollama: ollama run hf.co/AtomicChat/qwen36-27b-GGUF:Q4_K_M
• LM Studio / Jan: search the repo id, download any quant.

Best practices

Parameter	Value
temperature	1.0
top_p	0.95
top_k	20
min_p	0.0
repetition_penalty	1.0

Qwen's recommended sampling configuration for Qwen/Qwen3.6-27B.

Run in llama.cpp

git clone https://github.com/ggml-org/llama.cpp
cmake llama.cpp -B llama.cpp/build -DBUILD_SHARED_LIBS=OFF -DGGML_CUDA=ON
cmake --build llama.cpp/build --config Release -j --target llama-cli llama-server

./llama.cpp/build/bin/llama-server \
    -hf AtomicChat/qwen36-27b-GGUF:Q4_K_M \
    --jinja -ngl 99 -c 8192 -fa on

How these were made

1. Download Qwen/Qwen3.6-27B (original weights).
2. Convert to f16 GGUF with llama.cpp.
3. Build an importance matrix over our calibration corpus.
4. Quantize the ladder with --imatrix.
5. UD-Q4_K_XL additionally pins the token-embedding and output tensors to Q8_0.

License

Original model by Qwen, released under the Apache 2.0 license. Full terms: Apache 2.0. Quantized by Atomic Chat.