How to use from
Pi
Start the MLX server
# Install MLX LM:
uv tool install mlx-lm
# Start a local OpenAI-compatible server:
mlx_lm.server --model "TheCluster/Qwen3.8-27B-Heretic-MLX-4bit"
Configure the model in Pi
# Install Pi:
npm install -g @earendil-works/pi-coding-agent
# Add to ~/.pi/agent/models.json:
{
  "providers": {
    "mlx-lm": {
      "baseUrl": "http://localhost:8080/v1",
      "api": "openai-completions",
      "apiKey": "none",
      "models": [
        {
          "id": "TheCluster/Qwen3.8-27B-Heretic-MLX-4bit"
        }
      ]
    }
  }
}
Run Pi
# Start Pi in your project directory:
pi
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Qwen3.8-27B Heretic

Quality: quantized (4-bit, affine, group size: 64)

This is an uncensored version of Qwen/Qwen3.8-27B, made using Heretic v1.4.0.

Update: default reasoning_effort is set to 'low' to avoid overthinking.

Recommended settings

  1. Sampling Parameters: The developers suggest using the following sets of sampling parameters:

    • Thinking Mode: temperature=1.0, top_p=0.95, top_k=20, min_p=0.0, presence_penalty=0.0, repetition_penalty=1.0
    • Instruct (or non-thinking) mode: temperature=0.7, top_p=0.80, top_k=20, min_p=0.0, presence_penalty=1.5, repetition_penalty=1.0

    For supported frameworks, you can adjust the presence_penalty parameter between 0 and 2 to reduce endless repetition. However, using a higher value may occasionally result in language mixing and a slight decrease in model performance.

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