Qwen3.6-27B-A3B-CoderX

BF16 weights for CoderX — a long-horizon code prune of Qwen/Qwen3.6-35B-A3B: 256 experts per layer reduced to 184, ~35B → ~27B, still A3B active.

Same expert budget as the sibling Qwen3.6-27B-A3B-Coder, but a different selection plus a redistribution step: our saliency map picks the keep-set, a REAP-style per-layer floor (p=24) protects the tail, and the 72 evicted experts per layer are folded DERN-style into the survivors rather than discarded. Router, attention and norms are otherwise untouched. No fine-tuning, no distillation.

Built with omnimergekit.

Read this before you load it

  • Routing is top-8 (num_experts_per_tok: 8) — the base model's native setting, and measured rather than assumed: MBPP-full 0.784 / 0.790 at top-8 against 0.732 / 0.730 at top-10. The Coder sibling bakes top-10; this one does not.
  • The MTP block is included (mtp.*, in mtp.safetensors, indexed) for speculative decoding.
  • This checkpoint is text-only. architectures: Qwen3_5MoeForCausalLM, model_type: qwen3_5_moe_text — the base model's vision tower did not survive the redistribution step and is not present here. The Coder sibling's safetensors repo is multimodal (Qwen3_5MoeForConditionalGeneration); this one is not. The vision-<tier> tags on ollama get their vision tower from the Coder mmproj at the GGUF layer, so they are unaffected — but if you need a multimodal safetensors checkpoint, use Coder.

Quantised builds

Evaluation

Q6_K + imatrix, llama.cpp b9700, greedy (temperature 0.0 / top_p 1.0 / top_k 0), one pinned serving geometry per bench, read back from the server log.

Benchmark CoderX Coder (184e) Qwen3.6-35B-A3B (256e)
LiveCodeBench v6 (77q, 24k think / 48k total) 0.727 0.610 0.610
HumanEval+ (164) 0.970 0.951 0.939
MultiPL-E-100 (rs+java+js, 300 completions) 0.887 0.890 0.910

A same-basis repeat of MultiPL-E moved 1.0 pp on batch-scheduling nondeterminism alone, so the 0.33 pp CoderX↔Coder gap is a tie; the 2.33 pp gap to the teacher is real. Per language (CoderX / Coder / 256e): Rust 0.85 / 0.81 / 0.84 · Java 0.89 / 0.90 / 0.93 · JS 0.92 / 0.96 / 0.96.

The full canonical 9-bench suite has not been run on this checkpoint yet; non-code axes (GPQA, MATH-500, IFEval, ARC) are deliberately not quoted here.

Apache-2.0 · research checkpoint.

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