AtomicChat/Qwen3.5-27B-DFlash-GGUF overview

---

license: apache-2.0

thumbnail: https://huggingface.co/AtomicChat/Qwen3.5-27B-DFlash-GGUF/resolve/main/hero.png

base_model:

• z-lab/Qwen3.5-27B-DFlash

base_model_relation: quantized

quantized_by: AtomicChat

pipeline_tag: text-generation

library_name: gguf

tags:

• atomic-chat
• qwen3.5
• z-lab
• gguf
• llama.cpp
• quantized

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<a href="https://atomic.chat" style="flex:0 1 auto; min-width:0;"><img src="https://huggingface.co/AtomicChat/Qwen3.5-27B-DFlash-GGUF/resolve/main/pill_atomic_v3.png" alt="Atomic Chat" style="width:100%; height:auto; max-width:186px;"></a>

<a href="https://discord.gg/8wGSsvmg4V" style="flex:0 1 auto; min-width:0;"><img src="https://huggingface.co/AtomicChat/Qwen3.5-27B-DFlash-GGUF/resolve/main/pill_discord_v3.png" alt="Join Discord" style="width:100%; height:auto; max-width:184px;"></a>

<a href="https://github.com/AtomicBot-ai/Atomic-Chat" style="flex:0 1 auto; min-width:0;"><img src="https://huggingface.co/AtomicChat/Qwen3.5-27B-DFlash-GGUF/resolve/main/pill_github_v3.png" alt="GitHub" style="width:100%; height:auto; max-width:141px;"></a>

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<img src="https://huggingface.co/AtomicChat/Qwen3.5-27B-DFlash-GGUF/resolve/main/hero.png" alt="Qwen3.5 27B Dflash" style="width:100%; max-width:100%; height:auto; margin-bottom:0.6em;"/>

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<a href="https://huggingface.co/z-lab/Qwen3.5-27B-DFlash"><strong>Base model: z-lab/Qwen3.5-27B-DFlash</strong></a>

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Qwen3.5 27B Dflash, self-quantized to GGUF by Atomic Chat. Built straight from Z Lab's original weights with a per-tensor importance matrix, so this is not a repack of somebody else's files. Runs fully offline.

Highlights

• 2.1B parameters: the weights this repo quantizes.
• Context length: 262,144 tokens (256K), as published by Z Lab.
• 6 layers: Dense decoder, hybrid sliding-window (4096) and global attention.
• Full imatrix ladder: every quant is calibrated with an importance matrix.

> [!NOTE]

> 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.

> [!IMPORTANT]

> Always pass --jinja so the Qwen3.5 27B Dflash chat template is applied. Without it the model can emit malformed turns.

Model Overview

| Property | Value |

|---|---|

| Base model | z-lab/Qwen3.5-27B-DFlash |

| Parameters | 2.1B |

| Layers | 6 |

| Sliding window | 4096 tokens |

| Context length | 262,144 tokens (256K) |

| Vocabulary | 248,320 |

| Modalities | Text |

| Architecture | Dense decoder, hybrid sliding-window (4096) and global attention, 32 attention heads over 8 KV heads, DFlashDraftModel |

| This repo | GGUF quants (imatrix). Quants: Q8_0 |

Choosing a quant

| Quant | Size | Notes |

|---|---|---|

| Q8_0 | 2.3 GB | Effectively lossless, reference quality. |

> [!TIP]

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

Get started

Run Qwen3.5 27B Dflash locally with:

• Atomic Chat: the easiest path. Open the app, search AtomicChat/Qwen3.5-27B-DFlash-GGUF, pick a quant, hit Use this model.
• llama.cpp: llama-server -hf AtomicChat/Qwen3.5-27B-DFlash-GGUF:Q8_0 --jinja -c 8192
• Ollama: ollama run hf.co/AtomicChat/Qwen3.5-27B-DFlash-GGUF:Q8_0
• LM Studio / Jan: search the repo id, download any quant.

Best practices

| Parameter | Value |

|---|---|

| sampling defaults | not stated |

The base model card does not state sampling defaults.

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/Qwen3.5-27B-DFlash-GGUF:Q8_0 \
    --jinja -ngl 99 -c 8192 -fa on

How these were made

1. Download z-lab/Qwen3.5-27B-DFlash (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.

License

Original model by Z Lab, released under the Apache 2.0 license. Quantized by Atomic Chat.