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Qwen3.8-27B Opus personal-model release family

This four-repository family publishes the selected practical winner and its immutable trained-control comparator in BF16 and Apple-Silicon MLX 8-bit formats. The recommended default is the MLX 8-bit winner.

Selection language: practical personal-model selection with measured deviations. This release does not claim universal dominance or that every strict gate passed.

Repository Role Format Public model files Public model bytes
Qwen3.8-27B-Opus-Abliterix-Reasoning-MLX-8bit Recommended practical winner MLX 8-bit 17 30,390,836,635
Qwen3.8-27B-Opus-Abliterix-Reasoning-BF16 Full-precision practical winner BF16 Transformers 10 55,583,125,224
Qwen3.8-27B-Opus-Reasoning-Control-MLX-8bit Baseline comparator MLX 8-bit 17 30,390,836,197
Qwen3.8-27B-Opus-Reasoning-Control-BF16 Full-precision baseline comparator BF16 Transformers 20 55,583,123,681

Lineage

Qwen/Qwen3.8-27B → reasoning QLoRA merge (control-bf16) → Abliterix pass 1 (abliterix-pass1-bf16) → BF16 and affine MLX 8-bit/group-64 release variants.

Dataset preparation started from 12,842 raw rows and accepted 12,614 after 208 deduplications and 20 invalid-row removals; splits were 12,349 train / 127 validation / 138 test. Training used 1,544 optimizer steps, 108,789,760 trainable LoRA parameters, final validation loss 0.23739749, and token accuracy 91.7594%. The merged model retained 1,199 tensor keys, 15 native MTP tensors, and 333 vision tensors. The winner has 74 verified residual-writer edits and zero unexpected changes.

Local benchmark headline

These are self-run frozen local benchmarks, not official Qwen benchmarks.

Frozen local metric Control Abliterix winner
Harmful hard refusal 43.2% 0.0%
Harmful soft deflection 14.6% 0.2%
Harmful substantive response 47.0% 99.4%
Capability macro 17.6859% 21.0086%
Full code 16/421 10/421
HumanEval 7.9268% 4.2683%
Long-form pass 54.1667% 62.5000%
MMMU30 9/30 11/30
Held-out loss ratio 1.000000 1.024478
Benign KL 0.000000 0.093614

Strict deviations remain part of the release: KL 0.093614 > 0.05; incoherence 4.3077% > 2.7692%; HumanEval 4.2683% versus 7.9268%; full code 10/421 versus 16/421; repetition 5.8632% > 5%; prompt leakage detected; and 376/421 winner code generations hit the 512-token cap. Among outputs reaching execution, winner pass rate was 10/46 (21.74%) versus control 16/103 (15.53%), indicating termination/extraction pathology rather than a clean latent-code estimate.

The canonical structured record is benchmark-results.json.

Packaging boundary

Model weights and runtime metadata come from sealed source artifacts. Public manifests were regenerated from verified SHA-256/size receipts. Local paths, private prompt/training data, Drive identifiers, operational receipts, and internal release-control files are excluded. Each repository has a public per-file SHA256SUMS and manifests/artifact-manifest.json.

License

Apache-2.0, inherited from Qwen/Qwen3.8-27B. Copyright 2026 Alibaba Cloud; modifications and format conversions are described in each model card.