Qwopus3.6-27B-v2 ยท MTPLX 8-bit Quality

The first MTPLX build of Qwopus3.6-27B-v2 โ€” native multi-token-prediction speculative decoding on Apple Silicon, no external drafter, exact rejection sampling (Leviathanโ€“Chen with residual correction), so sampling behaves exactly like normal decoding, just faster.

Forged with mtplx forge build from the original BF16 Jackrong/Qwopus3.6-27B-v2:

  • Body: flat 8-bit MLX affine quantization, group size 64
  • MTP head: preserved in BF16 (mtp_policy: keep_bf16), packed as mtp.safetensors sidecar
  • Size: 29.4 GB
  • Calibrated MTP contract included (mtplx_runtime.json)

Measured performance (Apple M5 Max, 128 GB, MTPLX 1.0.3)

Mode Decode Acceptance by depth
Plain autoregressive ~17.5 tok/s โ€”
MTP depth 3 39.0 tok/s (2.2ร—) 94% / 86% / 74%

Verification suite: long-code-uncapped, 2048-token budget. For reference, the same machine runs Qwopus-v2 Q6_K on llama.cpp with MTP (n=2) at ~24โ€“26 tok/s โ€” this build is ~55% faster at higher body precision.

Usage

brew install youssofal/mtplx/mtplx   # or pipx install mtplx
mtplx pull nom666/Qwopus3.6-27B-v2-MTPLX-8bit-Quality
mtplx quickstart --model nom666/Qwopus3.6-27B-v2-MTPLX-8bit-Quality \
  --depth 3 --paged-kv-quantization q8 --batching-preset agent --reasoning off

Serves OpenAI-compatible (/v1/chat/completions) and Anthropic-compatible (/v1/messages) endpoints with warm-prefix KV reuse, SSD session cache, continuous batching, and vision support. Full 262144-token context; only 16 of 64 layers carry KV (hybrid Gated DeltaNet architecture), so KV at 256K is ~16 GiB BF16 / ~8 GiB q8.

Notes

  • Runtime contract tier is forge-local: verified on the forging machine (M5 Max). MTPLX loads it with an honest provenance note.
  • Thinking/reasoning can be left on; --reasoning off is recommended for terse agentic/coding use.
  • Quantized with MTPLX 1.0.3 Forge. All credit for the fine-tune to Jackrong; base model Qwen3.6-27B (Apache-2.0).
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