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 Blackfrost-AI/Lumix-4B:
# Run inference directly in the terminal:
llama cli -hf Blackfrost-AI/Lumix-4B:
Install from WinGet (Windows)
winget install llama.cpp
# Start a local OpenAI-compatible server with a web UI:
llama serve -hf Blackfrost-AI/Lumix-4B:
# Run inference directly in the terminal:
llama cli -hf Blackfrost-AI/Lumix-4B:
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 Blackfrost-AI/Lumix-4B:
# Run inference directly in the terminal:
./llama-cli -hf Blackfrost-AI/Lumix-4B:
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 Blackfrost-AI/Lumix-4B:
# Run inference directly in the terminal:
./build/bin/llama-cli -hf Blackfrost-AI/Lumix-4B:
Use Docker
docker model run hf.co/Blackfrost-AI/Lumix-4B:
Quick Links

Lumix-4B

Lumix-4B is a compact, vision-capable coding and reasoning model from Blackfrost, distributed as GGUF quantizations for llama.cpp and Ollama. It is a fine-tune of Qwen3.5-4B, tuned to drive the Shadow coding agent well above its size.

  • Base: Qwen/Qwen3.5-4B (GGUF architecture qwen35)
  • Parameters: ~4B
  • Modalities: text + vision (image input via the bundled mmproj)
  • Context: long-context, agentic coding — one clean tool call at a time, look → act → verify

Files

File Quant Notes
Lumix-4B-Q3_K_M.gguf Q3_K_M smallest
Lumix-4B-Q4_K_M.gguf Q4_K_M recommended
Lumix-4B-Q5_K_M.gguf Q5_K_M
Lumix-4B-Q6_K.gguf Q6_K
Lumix-4B-Q8_0.gguf Q8_0 near-lossless
Lumix-4B-f16.gguf F16 full precision
Lumix-4B-mmproj.gguf vision projector (pair with any quant for image input)

Usage

llama.cpp

llama-cli -hf Blackfrost-AI/Lumix-4B:Q4_K_M
# vision: also pass --mmproj Lumix-4B-mmproj.gguf and an --image

Ollama

ollama run hf.co/Blackfrost-AI/Lumix-4B:Q4_K_M

License

Released under the Apache-2.0 license.

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4B params
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