Instructions to use rubybear/FastContext-1.0-4B-SFT-mlx-4bit-g32 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-4bit-g32 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-4bit-g32")

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-4bit-g32 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-4bit-g32"

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-4bit-g32"
        }
      ]
    }
  }
}

Run Pi

# Start Pi in your project directory:
pi

Hermes Agent new

How to use rubybear/FastContext-1.0-4B-SFT-mlx-4bit-g32 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-4bit-g32"

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-4bit-g32

Run Hermes

hermes

MLX LM

How to use rubybear/FastContext-1.0-4B-SFT-mlx-4bit-g32 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-4bit-g32"

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-4bit-g32"
# 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-4bit-g32",
     "messages": [
       {"role": "user", "content": "Hello"}
     ]
   }'

FastContext-1.0-4B-SFT-mlx-4bit-g32

4-bit MLX quantization of microsoft/FastContext-1.0-4B-SFT with group_size=32 for Apple Silicon.

Quantization details

Method: Affine 4-bit
Group size: 32 (finer than the default 64)
Effective bits per weight: 5.0
Model size: 2.4 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	8.5	4.0G	0.507	0.140
affine 4-bit g32 (this model)	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

The finer group_size=32 delivers 12x better File F1 than standard 4-bit g64 quantization with only 300MB additional size.

Usage

from mlx_lm import load, generate

model, tokenizer = load("rubybear-lgtm/FastContext-1.0-4B-SFT-mlx-4bit-g32")

Or with fastcontext-mcp for Claude Code integration.

Downloads last month: -

Safetensors

Model size

0.8B params

Tensor type

BF16

U32

MLX

Hardware compatibility

4-bit

Model tree for rubybear/FastContext-1.0-4B-SFT-mlx-4bit-g32

Base model

Qwen/Qwen3-4B-Instruct-2507

Finetuned

microsoft/FastContext-1.0-4B-SFT

Quantized

(24)

this model