Qwen3.6-29B-REAP-Opus-Reasoning-Distill-GGUF

GGUF quantizations of a REAP-pruned (205/256 experts) Qwen3.6-35B-A3B MoE, merged with an Opus-reasoning-distilled LoRA adapter. This is the plain merge — no Multi-Token Prediction (MTP) head.

A version with an MTP head grafted on (for self-speculative decoding) is available at barozp/Qwen3.6-29B-REAP-Opus-Reasoning-Distill-MTP-GGUF. See the benchmarks below to decide which one fits your hardware.

Converted with llama.cpp's convert_hf_to_gguf.py.

Highlights

  • The reasoning LoRA beats the unpruned base model on ARC-Challenge (0.616 vs 0.532) — a net skill gain from distillation, not just recovered pruning loss. See Quality benchmarks.
  • Identical speed to the MTP release with speculative decoding off (219.06 vs 219.34 tok/s, full offload) — no downside to picking this file unless you specifically want the MTP speedup. See Benchmarks.

Files

Quant Size Notes
BF16 56.5 GB full precision reference
Q8_0 30.1 GB near-lossless
Q6_K 23.2 GB
Q5_K_M 20.2 GB
Q4_K_M 17.3 GB most popular K-quant
Q4_K_S 16.2 GB
IQ4_XS 15.3 GB imatrix-based, smaller & often better than Q4_K_S
Q3_K_M 13.7 GB
IQ3_M 12.6 GB
IQ3_XXS 11.2 GB
Q2_K 10.6 GB
IQ2_M 9.6 GB

All quants ≤Q4_K_M were calibrated with an importance matrix (imatrix) built from 512 samples of barozp/opus-reasoning-distill-train. K-quants (Q*_K*) favor broad compatibility and fast CPU inference; IQ-quants (IQ*) require the imatrix and give better quality per bit at ≤4-bit, at some CPU-inference speed cost.

Why choose this over the MTP version?

The MTP-grafted version carries an extra decoder layer used for self-speculative decoding. When that feature is left enabled on hardware that's memory-bandwidth-constrained (e.g. a small/weaker GPU with heavy CPU offload), the draft+verify overhead can compete with an already-scarce resource and result in slower generation than this plain model. This release removes that footgun entirely — no toggle to remember, always the same speed as the MTP file with speculative decoding off.

Benchmarks

Measured with llama-cli (Q4_K_M, flash attention on, greedy decoding, 5 runs per config, mean ± std) on an NVIDIA RTX PRO 6000 Blackwell Server Edition (97 GB VRAM). Full methodology and the MTP comparison are on the MTP-GGUF model card.

-ngl tok/s (generation)
99 (full offload) 219.06 ± 0.10
20 (partial offload) 58.60 ± 0.52

This matches the MTP-GGUF file with speculative decoding disabled (--spec-type none) within measurement noise — confirming the MTP head, when unused, carries no VRAM/compute penalty. If your setup benefits from speculative decoding (compute-bound, strong GPU, full offload), the MTP release may be faster; see its model card for numbers (+39–67% observed in our tests).

Quality benchmarks

Measured with lm-evaluation-harness (HF backend, bfloat16, chat template disabled — see note) on the underlying safetensors checkpoint, against the same base chain: unpruned Qwen3.6-35B-A3B → REAP 205/256 pruning only (no LoRA, RangerX/Qwen3.6-35B-REAP-Pruned-ratio-0.2) → this checkpoint.

Task Axis Qwen3.6-35B-A3B RangerX REAP-20% This model
wikitext perplexity (lower=better) sanity 7.85 10.06 10.06
MMLU out-of-calibration 0.8409 0.8152 0.8257
HellaSwag (0-shot, acc_norm) out-of-calibration 0.7420 0.7440 0.7340
ARC-Challenge (0-shot, acc_norm) out-of-calibration 0.5320 0.5340 0.6160

Key finding: the reasoning LoRA doesn't just recover REAP's pruning loss on ARC-Challenge — it pushes the score above the unpruned 256-expert base model (0.616 vs 0.532), a genuine reasoning-skill transfer from the Opus chain-of-thought training data (ARC-Challenge appears in neither REAP's calibration mixture nor the LoRA's training data). MMLU sees a smaller but real gain (+1.3pp retained vs. the LoRA-less pruned checkpoint); wikitext perplexity is unaffected; HellaSwag is flat within measurement noise.

Note: chat template was tested and found to badly corrupt loglikelihood-based multiple-choice scoring for this model family (MMLU dropped from 0.85 to 0.38 on the base model with it on) — all numbers above are with it off, applied consistently across every checkpoint. HellaSwag/ARC-Challenge are 0-shot, also applied consistently. Full methodology on the safetensors model card.

Credits

  • Base architecture: Qwen3.6-35B-A3B (MoE), pruned via REAP (Router-weighted Expert Activation Pruning) to 205/256 experts.
  • Reasoning distillation: LoRA fine-tune on Opus-generated reasoning traces (barozp/opus-reasoning-distill-train).
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