gemma-4-12B-it-qat-assistant-4bit

This repository contains Multi-Token Prediction (MTP) drafter weights split from google/gemma-4-12B-it-qat-q4_0-unquantized-assistant for use with mlx-vlm speculative decoding.

This is not a standalone chat or text-generation model. Load it as the draft model alongside a compatible Gemma 4 12B target checkpoint.

Use with mlx-vlm

uv run mlx_vlm.generate \
  --model google/gemma-4-12B-it \
  --draft-model mlx-community/gemma-4-12B-it-qat-assistant-4bit \
  --draft-kind mtp \
  --prompt "Describe this image." \
  --max-tokens 256

For local weights:

uv run mlx_vlm.generate \
  --model /path/to/target-model \
  --draft-model /path/to/gemma-4-12B-mtp \
  --draft-kind mtp \
  --prompt "Describe this image." \
  --max-tokens 256

Model Details

• Model type: gemma4_unified_assistant
• Target architecture: Gemma 4 12B
• Precision: 4bit
• Runtime: MLX / mlx-vlm
• Format: Safetensors with MLX-compatible config and tokenizer files

The stored tensors are 4bit MLX-compatible drafter weights.

Intended Use

Use this repo only as a speculative decoding drafter for compatible Gemma 4 12B checkpoints. The target model verifies drafted tokens, while this MTP model proposes candidate tokens per decoding step.

Limitations

This checkpoint requires runtime support for Gemma 4 MTP draft models in mlx-vlm. Standard standalone generation through generic Transformers APIs is not expected to work with this repository by itself.

Please refer to the upstream google/gemma-4-12B-it model card and license terms for model usage constraints.