Qwen3.5-4B-M2-OMv2

OMv2 recipe (OBIM-lite + DAREx-q + EMR election) without any importance-signal weighting. Isolates the recipe's contribution from the importance signal in the M3/M5 variants.

Sources

Weights: 0.55 (A) / 0.45 (B). Density: 0.53. Seed: 42.

Phase 1+2 comparison (Q6_K)

# Recipe Merger Importance HumanEval pass@1 MBPP pass@1
floor Qwen/Qwen3.5-4B (no merge) 60.37% 🥇 45.80%
src A Jackrong-v2 (Claude-4.6-Opus reasoning distill) 60.37% 45.00%
src B Crow-4B (Opus-4.6 distill, heretic) 54.88% 48.20%
M1 Vanilla DARE-TIES dare_ties_merge.py none 51.22% 47.00%
M2 (this) OMv2 recipe (OBIM-lite + DAREx-q + EMR election) dare_ties_merge.py none 52.44% 49.40%
M3 OMv2 + Fisher dare_ties_merge.py Fisher 57.93% 48.80%
M4 ex-LRP (mergekit PR #682) mergekit (PR #682) LRP 51.22% 49.40%
M4-v2 ex-LRP (PR #682 turbo, w=1/1, d=0.7) mergekit PR #682 turbo LRP 55.49% 52.20% 🥇
M5 OMv2 + LRP dare_ties_merge.py LRP 53.05% 51.40%

Eval methodology: llama-server (--reasoning-format deepseek --reasoning-budget 8192 --parallel 2 --cache-type-k q8_0 --cache-type-v q8_0 -c 32768) → lm_eval local-completions against raw /v1/completions, temperature 0, max_gen_toks=2048. All five variants scored under identical conditions. Floor reference: the top three rows are the base model and the two source fine-tunes evaluated under the same methodology. Hard finding: no merge beats Qwen3.5-4B base on HumanEval (best merge M3 = 57.93%, base = 60.37%). On MBPP, M4-v2 (52.20%) and M5 (51.40%) clearly beat both sources (best source: Crow at 48.20%) — merging does add MBPP capability, but borrows HumanEval ground.

Other variants in this study

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