MiniMax-M2 β€” Expert-Pruned (keep-192/256), GGUF

A research artifact on structurally compressing a 230B Mixture-of-Experts coding agent (MiniMax-M2: 256 experts/layer, top-8) by pruning experts β€” keeping it a working agent in a real tool-using loop, not just a fluent generator. This is the keep-192 point: 192 of 256 experts kept (top-K by measured code/agentic activation), ~30% smaller, still solves real SWE tasks.

πŸ‘‰ Full field report: ARTICLE.md.

The headline: capability scales smoothly with the expert budget

Evaluated as a real coding agent (a harness driving the model through a Dockerized repo: read, edit, run tests) on a 6-instance SWE-bench Verified probe set (the exact instances the un-pruned model resolves 6/6), served via Ollama:

Variant Size (GGUF) Experts kept SWE resolved
Full M2 (IQ2_M) 78 GB 256 / 256 6 / 6
keep-192 (this repo) ~55 GB 192 / 256 3 / 6
keep-160 46 GB 160 / 256 1 / 6
IQ1 (all experts, 1.8-bit) 48 GB 256 / 256 0 / 6

Two findings worth taking away:

  1. No cliff β€” agentic capability degrades smoothly as you remove experts (6 β†’ 3 β†’ 1), it doesn't collapse. You can drop a quarter of the experts and keep half the solving.
  2. At a fixed size, prune > uniform-extreme-quant β€” keep-160 (46 GB, 160 experts at ~2.7-bit) resolves where IQ1 (48 GB, all 256 at 1.8-bit) resolves nothing. Concentrating the bit budget on fewer experts beats spreading it thin.

These models are untrained (pure pruned quant, no fine-tune) β€” so the resolves are genuine compressed-M2 capability, not memorization.

Use it

# Ollama (the GGUF is in this repo):
ollama create m2-pruned192 -f Modelfile
ollama run m2-pruned192

Or point any llama.cpp/GGUF runtime at M2-pruned192-IQ2.gguf. Use a generous context for agent loops (the M2 chat template + stop tokens are baked into the Modelfile).

Reproduce

# Prune the kept experts out of an IQ2_M GGUF of MiniMax-M2 (clean slice, no re-quant):
python prune_gguf_experts.py \
  --in MiniMax-M2-IQ2_M.gguf --out M2-pruned192.gguf \
  --keep 192 --strategy file --keep-file keep192_experts.json

keep192_experts.json is the per-layer expert keep-set (top-K by measured activation on a code/agentic calibration corpus).

Limitations

  • Research artifact, not a production release. At ~55 GB it solves 3/6 of this probe set; the full 78 GB quant solves 6/6 β€” pruning trades size for capability along the curve above.
  • Untrained. A recovery fine-tune ("heal") on top should push it further up the curve (separate work).
  • Honest framing: this is not "better than the full model" β€” it's a smaller point on a clean size↔capability curve, and at a fixed budget it beats a same-size uniform low-bit quant.

License

Apache-2.0, inheriting MiniMax-M2's terms. This repo adds a pruning recipe + a pruned GGUF derived from a quantized MiniMax-M2.

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