Instructions to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Notebooks
Google Colab
Kaggle
Local Apps Settings

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with 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 CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M
# Run inference directly in the terminal:
llama cli -hf CodeFault/Mellum2-12B-A2.5B-Thinking-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 CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M
# Run inference directly in the terminal:
llama cli -hf CodeFault/Mellum2-12B-A2.5B-Thinking-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 CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M
# Run inference directly in the terminal:
./llama-cli -hf CodeFault/Mellum2-12B-A2.5B-Thinking-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 CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M
# Run inference directly in the terminal:
./build/bin/llama-cli -hf CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Use Docker

docker model run hf.co/CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

LM Studio
Jan

vLLM

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Ollama
How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with Ollama:
```
ollama run hf.co/CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M
```

Unsloth Studio

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with Unsloth Studio:

Install Unsloth Studio (macOS, Linux, WSL)

curl -fsSL https://unsloth.ai/install.sh | sh
# Run unsloth studio
unsloth studio -H 0.0.0.0 -p 8888
# Then open http://localhost:8888 in your browser
# Search for CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF to start chatting

Install Unsloth Studio (Windows)

irm https://unsloth.ai/install.ps1 | iex
# Run unsloth studio
unsloth studio -H 0.0.0.0 -p 8888
# Then open http://localhost:8888 in your browser
# Search for CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF to start chatting

Using HuggingFace Spaces for Unsloth

# No setup required
# Open https://huggingface.co/spaces/unsloth/studio in your browser
# Search for CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF to start chatting

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with Pi:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama serve -hf CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Configure the model in Pi

# Install Pi:
npm install -g @mariozechner/pi-coding-agent
# Add to ~/.pi/agent/models.json:
{
  "providers": {
    "llama-cpp": {
      "baseUrl": "http://localhost:8080/v1",
      "api": "openai-completions",
      "apiKey": "none",
      "models": [
        {
          "id": "CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M"
        }
      ]
    }
  }
}

Run Pi

# Start Pi in your project directory:
pi

Hermes Agent new

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with Hermes Agent:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama serve -hf CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Configure Hermes

# Install Hermes:
curl -fsSL https://hermes-agent.nousresearch.com/install.sh | bash
hermes setup
# Point Hermes at the local server:
hermes config set model.provider custom
hermes config set model.base_url http://127.0.0.1:8080/v1
hermes config set model.default CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Run Hermes

hermes

Atomic Chat new

OpenClaw new

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with OpenClaw:

Start the llama.cpp server

# Install llama.cpp:
brew install llama.cpp
# Start a local OpenAI-compatible server:
llama serve -hf CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Configure OpenClaw

# Install OpenClaw:
npm install -g openclaw@latest
# Register the local server and set it as the default model:
openclaw onboard --non-interactive --mode local \
  --auth-choice custom-api-key \
  --custom-base-url http://127.0.0.1:8080/v1 \
  --custom-model-id "CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M" \
  --custom-provider-id llama-cpp \
  --custom-compatibility openai \
  --custom-text-input \
  --accept-risk \
  --skip-health

Run OpenClaw

openclaw agent --local --agent main --message "Hello from Hugging Face"

Docker Model Runner
How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with Docker Model Runner:
```
docker model run hf.co/CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M
```

Lemonade

How to use CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF with Lemonade:

Pull the model

# Download Lemonade from https://lemonade-server.ai/
lemonade pull CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q4_K_M

Run and chat with the model

lemonade run user.Mellum2-12B-A2.5B-Thinking-GGUF-Q4_K_M

List all available models

lemonade list

Mellum2-12B-A2.5B-Thinking - GGUF

Quantized GGUF version of JetBrains/Mellum2-12B-A2.5B-Thinking. These were generated using the default settings with llama-quantize (b9482).

Quantizations provided

File	Quantization	Size
`Mellum2-12B-A2.5B-Thinking-Q4_0.gguf`	Q4_0¹	6.91 GB
`Mellum2-12B-A2.5B-Thinking-Q4_K_S.gguf`	Q4_K_S	7.4 GB
`Mellum2-12B-A2.5B-Thinking-Q4_K_M.gguf`	Q4_K_M	8.07 GB
`Mellum2-12B-A2.5B-Thinking-Q5_K_M.gguf`	Q5_K_M	9.21 GB
`Mellum2-12B-A2.5B-Thinking-Q6_K.gguf`	Q6_K	10.9 GB
`Mellum2-12B-A2.5B-Thinking-Q8_0.gguf`	Q8_0	12.9 GB

1: Q4_0 is not recommended. Perplexity doubled which suggests degredated quality, and I encountered endlessly repeating tokens with my test prompt.

Perplexity test

I tested perplexity using llama-perplexity and Salesforce's wikitext-2-raw-v1.

File	Quantization	Ctx	PPL
`Mellum2-12B-A2.5B-Thinking-Q4_0.gguf`	Q4_0	512	18.6689 +/- 0.17737
`Mellum2-12B-A2.5B-Thinking-Q4_K_S.gguf`	Q4_K_S	512	9.8269 +/- 0.07248
`Mellum2-12B-A2.5B-Thinking-Q4_K_M.gguf`	Q4_K_M	512	9.7410 +/- 0.07128
`Mellum2-12B-A2.5B-Thinking-Q5_K_M.gguf`	Q5_K_M	512	9.4490 +/- 0.06807
`Mellum2-12B-A2.5B-Thinking-Q6_K.gguf`	Q6_K	512	9.7329 +/- 0.07207
`Mellum2-12B-A2.5B-Thinking-Q8_0.gguf`	Q8_0	512	9.3657 +/- 0.06734
`Mellum2-12B-A2.5B-Thinking-BF16.gguf`	BF16	512	9.4037 +/- 0.06784

Serving with llama.cpp

llama.cpp added support for Mellum2 in release b9482. It has a max context size of 131,072. This can be served using:

llama-server \
  -hf CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF:Q5_K_M \
  --temp 0.6 \
  --top-p 0.95 \
  --top-k 20

Downloads last month: 115

GGUF

Model size

12B params

Architecture

mellum

Hardware compatibility

4-bit

5-bit

6-bit

8-bit

Model tree for CodeFault/Mellum2-12B-A2.5B-Thinking-GGUF

Base model

JetBrains/Mellum2-12B-A2.5B-Thinking

Quantized

(34)

this model