How to use from
llama.cpp
Install (macOS, Linux)
curl -LsSf https://llama.app/install.sh | sh
# Start a local OpenAI-compatible server with a web UI:
llama serve -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
# Run inference directly in the terminal:
llama cli -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
Install from WinGet (Windows)
winget install llama.cpp
# Start a local OpenAI-compatible server with a web UI:
llama serve -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
# Run inference directly in the terminal:
llama cli -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
Use pre-built binary
# Download pre-built binary from:
# https://github.com/ggerganov/llama.cpp/releases
# Start a local OpenAI-compatible server with a web UI:
./llama-server -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
# Run inference directly in the terminal:
./llama-cli -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
Build from source code
git clone https://github.com/ggerganov/llama.cpp.git
cd llama.cpp
cmake -B build
cmake --build build -j --target llama-server llama-cli
# Start a local OpenAI-compatible server with a web UI:
./build/bin/llama-server -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
# Run inference directly in the terminal:
./build/bin/llama-cli -hf vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
Use Docker
docker model run hf.co/vumpt/Qwen3.8-Flash-Next-GGUF:Q4_K_M
Quick Links

Qwen3.8-Flash-Next — GGUF (Q4_K_M)

GGUF conversion of Qwen/Qwen3.8-Flash-Next, the Qwen4-experimental hybrid model (Gated DeltaNet + Qwen Sparse Attention + 512-expert MoE + n-gram "PLE" embedding table).

  • 125B total MoE params (6B active) + 51B n-gram table + 4B MTP = 180B params
  • Converted with the in-flight llama.cpp PR #27742 (qwen4exp architecture support)

Quantization layout

Q4_K_M recipe. Because several tensor shapes in this architecture aren't divisible by 256, llama.cpp's type-fallback applies per-tensor (this is a feature of PR #27742's quantizer fixes, not an error):

Component Quant
MoE experts / attention / FFN Q4_K_M (fallback to Q5_0/q8_0 where ncols % 256 ≠ 0)
Token embedding + output Q6_K
N-gram (PLE) hash table (51B params) Q5_0 (160-col layout → falls back from Q6_K)

Files

File Quant Size
qwen3.8-flash-next-Q4_K_M.gguf Q4_K_M ~120 GB

Usage (llama.cpp)

git clone https://github.com/ggml-org/llama.cpp
cd llama.cpp
git fetch origin pull/27742/head:qwen4exp && git checkout qwen4exp
cmake -B build && cmake --build build -j --target llama-cli
./build/bin/llama-cli -m qwen3.8-flash-next-Q4_K_M.gguf -p "Hello" -ngl 99

Note: This architecture is only supported on the PR #27742 branch. Mainline llama.cpp (as of this writing) does not load qwen4_exp. Use the branch above.

Source

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Model size
177B params
Architecture
qwen4exp
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