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Sponsored by
APIMart
AtomicChat / Qwen3.5-27B-DFlash-GGUF
Model's Last Updated: July 23 2026
text-generation
Introduction of Qwen3.5-27B-DFlash-GGUF
Model Details of Qwen3.5-27B-DFlash-GGUF
Qwen3.5 27B DFlash , the DFlash speculative-decoding draft converted to GGUF by Atomic Chat . Built straight from z-lab 's original weights. Runs fully offline.
What this is
DFlash
is a speculative-decoding method that drafts a whole
block
of candidate tokens in a single forward pass using a lightweight block-diffusion model, instead of one token at a time. This repo is the
draft component only
— it does nothing on its own. You run it alongside the target model
Qwen/Qwen3.5-27B
, which verifies the drafted block and keeps the longest correct prefix. Output is identical to running the target alone, just faster.
These GGUFs are converted from z-lab's original weights , not a repack of someone else's GGUF. The draft attaches to any GGUF of the target model (Atomic, unsloth, bartowski, ...).
Run in llama.cpp
Needs a build of
llama.cpp
with DFlash speculative decoding (PR #22105). You supply the target as
-m
and this draft as
-md
:
./llama-server \
-m Qwen3.5-27B.gguf \
-md Qwen3.5-27B-DFlash.Q8_0.gguf \
--spec-type draft-dflash --spec-draft-n-max 15 \
-ngl 99 -fa on --jinja -c 8192
DFlash is trained for
non-thinking
generation — pass
enable_thinking=false
in the chat template for best acceptance.
Choosing a quant
| Quant | Size | Notes |
|---|---|---|
Q8_0
|
2.27 GB | Recommended. Near-lossless draft head, small and fast to draft with. |
Performance
z-lab report up to
6.17x
lossless acceleration on their reference stack (vLLM / SGLang / Transformers). In
llama.cpp
today the DFlash port is newer: in our tests
dense
targets get roughly
1.8x-2.8x
end-to-end on code generation, and acceptance climbs on larger targets and structured/code output. Acceptance and speedup depend on the target and the content, not on the quantization. Speedups shrink on free-form prose and on small-active MoE targets.
License
Released by z-lab under the MIT license. Converted to GGUF by Atomic Chat. See the DFlash paper and project page .
Runs of AtomicChat Qwen3.5-27B-DFlash-GGUF on huggingface.co
124
Total runs
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24-hour runs
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11
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30-day runs
More Information About Qwen3.5-27B-DFlash-GGUF huggingface.co Model
Url of Qwen3.5-27B-DFlash-GGUF
Qwen3.5-27B-DFlash-GGUF huggingface.co Url
Provider of Qwen3.5-27B-DFlash-GGUF huggingface.co
Other API from AtomicChat
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