Instructions to use cjnielson44/gpt-oss-120b-oQ4 with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use cjnielson44/gpt-oss-120b-oQ4 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("cjnielson44/gpt-oss-120b-oQ4")

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 cjnielson44/gpt-oss-120b-oQ4 with Pi:

Start the MLX server

# Install MLX LM:
uv tool install mlx-lm
# Start a local OpenAI-compatible server:
mlx_lm.server --model "cjnielson44/gpt-oss-120b-oQ4"

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": "cjnielson44/gpt-oss-120b-oQ4"
        }
      ]
    }
  }
}

Run Pi

# Start Pi in your project directory:
pi

Hermes Agent new

How to use cjnielson44/gpt-oss-120b-oQ4 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 "cjnielson44/gpt-oss-120b-oQ4"

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 cjnielson44/gpt-oss-120b-oQ4

Run Hermes

hermes

OpenClaw new

How to use cjnielson44/gpt-oss-120b-oQ4 with OpenClaw:

Start the MLX server

# Install MLX LM:
uv tool install mlx-lm
# Start a local OpenAI-compatible server:
mlx_lm.server --model "cjnielson44/gpt-oss-120b-oQ4"

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 "cjnielson44/gpt-oss-120b-oQ4" \
  --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 cjnielson44/gpt-oss-120b-oQ4 with MLX LM:

Generate or start a chat session

# Install MLX LM
uv tool install mlx-lm
# Interactive chat REPL
mlx_lm.chat --model "cjnielson44/gpt-oss-120b-oQ4"

Run an OpenAI-compatible server

# Install MLX LM
uv tool install mlx-lm
# Start the server
mlx_lm.server --model "cjnielson44/gpt-oss-120b-oQ4"
# Calling the OpenAI-compatible server with curl
curl -X POST "http://localhost:8000/v1/chat/completions" \
   -H "Content-Type: application/json" \
   --data '{
     "model": "cjnielson44/gpt-oss-120b-oQ4",
     "messages": [
       {"role": "user", "content": "Hello"}
     ]
   }'

gpt-oss-120b-oQ4 / README.md

cjnielson44

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license: apache-2.0
base_model: openai/gpt-oss-120b
library_name: mlx
tags:
  - mlx
  - omlx
  - gpt_oss
  - quantized
  - oQ4
  - apple-silicon

gpt-oss-120b-oQ4

This is an oMLX oQ4 quantized MLX checkpoint for gpt-oss-120b, published for local inference with oMLX on Apple Silicon.

Notes

Quantized with oMLX oQ4.
Non-expert tensors use the oQ4 affine quantization plan generated by oMLX.
GPT-OSS MoE expert projection tensors are preserved as MXFP4 passthrough tensors and are marked with per-layer mxfp4 overrides in config.json; this is required for oMLX/MLX loading.
Tested locally with oMLX model discovery/load after generation.

Local oMLX Use

Place or symlink the repo folder under an oMLX model directory, for example:

~/.omlx/models/cjnielson44/gpt-oss-120b-oQ4

Then load model id:

gpt-oss-120b-oQ4

Source

The local source checkpoint used for this conversion was the oMLX-compatible gpt-oss-120b MLX checkpoint in the Hugging Face cache.