Instructions to use rubybear/FastContext-1.0-4B-SFT-mlx-8bit with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use rubybear/FastContext-1.0-4B-SFT-mlx-8bit with MLX:

# Make sure mlx-lm is installed
# pip install --upgrade mlx-lm

# Generate text with mlx-lm
from mlx_lm import load, generate

model, tokenizer = load("rubybear/FastContext-1.0-4B-SFT-mlx-8bit")

prompt = "Write a story about Einstein"
messages = [{"role": "user", "content": prompt}]
prompt = tokenizer.apply_chat_template(
    messages, add_generation_prompt=True
)

text = generate(model, tokenizer, prompt=prompt, verbose=True)

Notebooks
Google Colab
Kaggle
Local Apps Settings
LM Studio

How to use rubybear/FastContext-1.0-4B-SFT-mlx-8bit with Pi:

Start the MLX server

# Install MLX LM:
uv tool install mlx-lm
# Start a local OpenAI-compatible server:
mlx_lm.server --model "rubybear/FastContext-1.0-4B-SFT-mlx-8bit"

Configure the model in Pi

# Install Pi:
npm install -g @mariozechner/pi-coding-agent
# Add to ~/.pi/agent/models.json:
{
  "providers": {
    "mlx-lm": {
      "baseUrl": "http://localhost:8080/v1",
      "api": "openai-completions",
      "apiKey": "none",
      "models": [
        {
          "id": "rubybear/FastContext-1.0-4B-SFT-mlx-8bit"
        }
      ]
    }
  }
}

Run Pi

# Start Pi in your project directory:
pi

Hermes Agent new

How to use rubybear/FastContext-1.0-4B-SFT-mlx-8bit with Hermes Agent:

Start the MLX server

# Install MLX LM:
uv tool install mlx-lm
# Start a local OpenAI-compatible server:
mlx_lm.server --model "rubybear/FastContext-1.0-4B-SFT-mlx-8bit"

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 rubybear/FastContext-1.0-4B-SFT-mlx-8bit

Run Hermes

hermes

OpenClaw new

How to use rubybear/FastContext-1.0-4B-SFT-mlx-8bit with OpenClaw:

Start the MLX server

# Install MLX LM:
uv tool install mlx-lm
# Start a local OpenAI-compatible server:
mlx_lm.server --model "rubybear/FastContext-1.0-4B-SFT-mlx-8bit"

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 "rubybear/FastContext-1.0-4B-SFT-mlx-8bit" \
  --custom-provider-id mlx-lm \
  --custom-compatibility openai \
  --custom-text-input \
  --accept-risk \
  --skip-health

Run OpenClaw

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

MLX LM

How to use rubybear/FastContext-1.0-4B-SFT-mlx-8bit with MLX LM:

Generate or start a chat session

# Install MLX LM
uv tool install mlx-lm
# Interactive chat REPL
mlx_lm.chat --model "rubybear/FastContext-1.0-4B-SFT-mlx-8bit"

Run an OpenAI-compatible server

# Install MLX LM
uv tool install mlx-lm
# Start the server
mlx_lm.server --model "rubybear/FastContext-1.0-4B-SFT-mlx-8bit"
# Calling the OpenAI-compatible server with curl
curl -X POST "http://localhost:8000/v1/chat/completions" \
   -H "Content-Type: application/json" \
   --data '{
     "model": "rubybear/FastContext-1.0-4B-SFT-mlx-8bit",
     "messages": [
       {"role": "user", "content": "Hello"}
     ]
   }'

FastContext-1.0-4B-SFT-mlx-8bit

File size: 1,340 Bytes

e9ec065

---
language:
- en
license: mit
tags:
- Explorer SubAgent
- Repository Exploration
- mlx
library_name: mlx
base_model: microsoft/FastContext-1.0-4B-SFT
pipeline_tag: text-generation
---

# FastContext-1.0-4B-SFT-mlx-8bit

8-bit MLX quantization of [microsoft/FastContext-1.0-4B-SFT](https://huggingface.co/microsoft/FastContext-1.0-4B-SFT) for Apple Silicon.

## Quantization details

- **Method:** Affine 8-bit
- **Group size:** 64
- **Effective bits per weight:** 8.5
- **Model size:** 4.0 GB (vs 7.5 GB bf16)

## Benchmark results

Tested on 10 SWE-bench Multilingual instances against other quantization variants:

| Model | Bits/Wt | Size | File F1 | Line F1 |
|-------|---------|------|---------|---------|
| **affine 8-bit g64 (this model)** | **8.5** | **4.0G** | **0.507** | **0.140** |
| affine 4-bit g32 | 5.0 | 2.4G | 0.300 | 0.090 |
| affine 3-bit g64 | 3.5 | 1.7G | 0.100 | 0.000 |
| affine 4-bit g64 | 4.5 | 2.1G | 0.050 | 0.005 |
| mattrobenolt 4-bit g64 | 4.5 | 2.1G | 0.025 | 0.008 |

Highest quality quantization — best File F1 and Line F1 at the cost of larger size and slower inference.

## Usage

```python
from mlx_lm import load, generate

model, tokenizer = load("rubybear/FastContext-1.0-4B-SFT-mlx-8bit")
```

Or with [fastcontext-mcp](https://github.com/rubybear-lgtm/fastcontext) for Claude Code integration.