{
 "version": 1,
 "family": "qwen4_exp",
 "source": {
  "bits": 8,
  "group_size": 64,
  "mode": "affine",
  "tied": false
 },
 "eligible": true,
 "proposal_bits": 4,
 "basis": "settled 2026-09-03 A/B on Qwen3.8-Flash-Next-JANG_4S fixed-D3: q4 proposal head +2.3-3.0% count / +1.8-2.8% code over three same-thermal pairs; target verify keeps the checkpoint head",
 "draft_artifact": {
  "file": "mtp_draft/vmlx_mtp_proposal_head.safetensors",
  "sha256": "b05e7c98c4985c85a91518892ed78a62f017d73c1b8007382fa1bf343de4dc3f",
  "bits": 4,
  "group_size": 64,
  "mode": "affine",
  "method": "imatrix-weighted affine ALS refit of the bundle's own q8/g64 lm_head (qwen4_exp.affine_mx.refit_quantize_mx)",
  "imatrix": "q38fn-calib/capture/diag.safetensors lm_head.diag (H200 capture 2026-08-26, the conversion's own imatrix)",
  "weighted_nmse": {
   "rtn_q4": 0.004310761112719774,
   "calibrated_q4": 0.0022888502571731806
  },
  "acceptance_validated": false,
  "notes": "Runtimes unaware of this block keep the RTN rebuild (fail-open). Users of the artifact must sha256-verify and fall back to RTN on mismatch. acceptance_validated flips true only after a measured live A/B."
 }
}