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@@ -36,6 +36,25 @@ with the native vision tower and native MTP head carried over untouched.
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  - **imatrix-calibrated.** All quants below Q3_K_M use an importance matrix
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  built from the model's own reasoning-distillation data (see [Imatrix](#imatrix)).
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  ## Quality benchmarks (of the source safetensors model)
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  Measured with `lm-evaluation-harness`: **0-shot, loglikelihood (multiple-choice),
@@ -169,3 +188,5 @@ llama-cli -m Qwen3.8-27B-Opus-Distill-Q4_K_M.gguf -no-cnv --spec-type draft-mtp
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  [Qwen/Qwen3.8-27B](https://huggingface.co/Qwen/Qwen3.8-27B) (base)
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  → [barozp/Qwen3.8-27B-Opus-Distill](https://huggingface.co/barozp/Qwen3.8-27B-Opus-Distill) (LoRA finetune, safetensors)
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  → **this repo** (GGUF quantizations)
 
 
 
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  - **imatrix-calibrated.** All quants below Q3_K_M use an importance matrix
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  built from the model's own reasoning-distillation data (see [Imatrix](#imatrix)).
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+ ## Known issues
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+
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+ **Reasoning loop under stacked output-format constraints.** Reported by
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+ [zxbc2023](https://huggingface.co/zxbc2023) ([full writeup, discussion #1](https://huggingface.co/barozp/Qwen3.8-27B-Opus-Distill/discussions/1)).
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+ Combining `"no prose"` with a second output-format constraint (e.g. `"no
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+ markdown"` or `"no comments"`) can send this model into a non-converging
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+ self-verification reasoning loop -- it burns the entire token budget with
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+ **zero visible output**. Fully deterministic and reproducible at temp=0.
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+ Root cause: traced to part of the training data being sourced from
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+ reconstructed (not verbatim) Opus reasoning traces, not a capability gap.
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+
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+ **Fixed in [barozp/Qwen3.8-27B-Opus-Distill-v2-clean](https://huggingface.co/barozp/Qwen3.8-27B-Opus-Distill-v2-clean)**
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+ -- retrained on a rebuilt dataset where every row is traced to a verified
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+ genuine source. If you're hitting this, switch to v2-clean.
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+
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+ **Workaround if staying on this version:** avoid combining `"no prose"` with
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+ another format constraint, or raise the generation token budget to >=4096
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+ for constrained code-gen tasks.
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+
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  ## Quality benchmarks (of the source safetensors model)
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  Measured with `lm-evaluation-harness`: **0-shot, loglikelihood (multiple-choice),
 
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  [Qwen/Qwen3.8-27B](https://huggingface.co/Qwen/Qwen3.8-27B) (base)
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  → [barozp/Qwen3.8-27B-Opus-Distill](https://huggingface.co/barozp/Qwen3.8-27B-Opus-Distill) (LoRA finetune, safetensors)
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  → **this repo** (GGUF quantizations)
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+
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+ See [Known Issues](#known-issues) above -- if you're hitting the reasoning-loop bug, [barozp/Qwen3.8-27B-Opus-Distill-v2-clean-GGUF](https://huggingface.co/barozp/Qwen3.8-27B-Opus-Distill-v2-clean-GGUF) fixes it.