Granite-4.2-3B-Heretic-NX-PRIME-GGUF / EVALUATION_SUMMARY.md
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Evaluation summary

Selected checkpoint

  • Model: Granite 4.2 3B Heretic NX PRIME
  • Residual-stream protection rank: 16
  • Beta: 2.4
  • Layers: 25 through 36
  • Projection families: attention output and MLP down projection
  • Source revision: b7e947307dd2efb3ad3b853b0e8a7e75f8ad4ac2

Fixed 104-row refusal proxy

The final static checkpoint was reloaded using Transformers NF4. It produced 0 explicit-refusal marker hits on 104 fixed held-out prompts. The official base produced 103 marker hits under the same lexical detector.

This detector looks only for explicit refusal phrases. It does not establish whether an answer completed a harmful task, and it must not be interpreted as a general safety or quality score.

First-token KL

Two distinct protocols are reported:

  1. Activation-native screen: the official base is loaded once in NF4 and the candidate residual intervention is applied through runtime hooks. Beta 2.4 scored 0.0246739865 KL and 1/104 refusal markers.
  2. Artifact validation: the official BF16 source and edited BF16 checkpoint are quantized independently to NF4 before comparison. The static beta 2.4 checkpoint scored 0.0424175691 KL and 0/104 refusal markers.

The independent-quantization protocol includes quantization variance; it is not a pure BF16-to-BF16 KL measurement.

Capability slice

Deterministic first-token multiple-choice scoring was run on 854 paired rows:

Task Base Candidate
ARC-Challenge, 256 rows 72.27% 72.27%
HellaSwag, 256 rows 64.06% 64.84%
MMLU, 342 rows 56.14% 57.89%
Combined 63.35% 64.29%

The paired bootstrap mean difference was +0.9368 percentage point. The 95% interval was [-0.3513, +2.2248] points. Non-inferiority passed at a predeclared -3 percentage-point margin, and the equivalence gate passed.

GGUF validation

The BF16, Q8_0 and Q4_K_M files were converted with llama.cpp b10621. Each file loaded successfully and completed a one-token inference smoke test using the same llama.cpp build. No full behavioral equivalence claim is made for the quantized GGUF variants until a dedicated GGUF-native 104-row evaluation is run.