Qwen3.8-27B-MLX-6bit

Qwen3.8-27B MLX 6-bit

This is a modified, 6-bit MLX quantization of Alibaba Cloud's official Qwen/Qwen3.8-27B checkpoint. It is intended for local inference on Apple Silicon and can be paired with the separately distributed native-MTP artifact from the same source revision.

Artifact identity

• Base model: Qwen/Qwen3.8-27B
• Base revision: 1d4bf0f2ff6012fd82039f2fa52739d0dd7c60c0
• Quantization: affine 6-bit, group size 64
• Native context length: 262,144 tokens
• Weight shards: five MLX SafeTensors files
• Approximate on-disk size: 20 GB

The internal Transformers/MLX architecture identifiers retain the qwen3_5 name because Qwen3.8 uses the compatible architectural foundation. Those implementation identifiers do not change the checkpoint identity.

Reproduction

Using MLX LM 0.31.3 and MLX 0.32.0:

mlx_lm.convert \
  --hf-path /path/to/Qwen3.8-27B \
  --mlx-path /path/to/Qwen3.8-27B-MLX-6bit \
  --quantize --q-bits 6 --q-group-size 64 --q-mode affine

The source directory must correspond to the exact base revision above. Verify the converted files against SHA256SUMS before publishing or loading them.

Use with Qwen Prime Runtime

qwen-prime-runtime configure \
  --target /path/to/Qwen3.8-27B-MLX-6bit \
  --draft /path/to/Qwen3.8-27B-MTP-MLX-6bit
qwen-prime-runtime doctor
qwen-prime-runtime serve

Performance

No throughput is guaranteed. On the development M4 Max, a warm 256-token coding request measured approximately 26 server tokens/second with 53.9% draft acceptance. A direct block-size sweep measured approximately 28 tokens/second at block size four. Results vary with hardware, prompt length, cache state, generation length, and acceptance ratio.

License and attribution

The original Qwen3.8-27B model is Copyright 2026 Alibaba Cloud and is licensed under Apache License 2.0. This directory includes the original license. The weights and metadata in this repository were modified by conversion and quantization for MLX; see NOTICE and quantization_provenance.json.

The Apache license does not grant trademark rights. This is an independent derivative and is not endorsed by Alibaba Cloud or the Qwen team.