{
  "sphragis_version": "0.1.0",
  "generated_at": "2026-07-27T11:21:13.795774+00:00",
  "reference": {
    "endpoint": "http://127.0.0.1:8080/v1",
    "model": "ref"
  },
  "candidate": {
    "endpoint": "http://127.0.0.1:8081/v1",
    "model": "cand"
  },
  "pack": {
    "name": "/root/pack_v2.jsonl",
    "n_tasks": 2800,
    "sha256": "2de27099bbb15bab4f7b35599b215f038fdb68b3f5f4e1cda1a464f9dd18e14e"
  },
  "overall": "FAIL",
  "claim": "At least one axis shows a statistically significant accuracy regression (exact McNemar, Holm-corrected, alpha=0.05).",
  "axes": [
    {
      "axis": "arithmetic",
      "n": 1400,
      "counts": {
        "both_correct": 1208,
        "ref_only": 22,
        "cand_only": 9,
        "both_wrong": 161
      },
      "acc_reference": 0.878571,
      "acc_candidate": 0.869286,
      "regression_d": 0.009286,
      "d_ci": [
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      "d_upper_bound": 0.015714,
      "p_regression": 0.01472469,
      "p_regression_holm": 0.04417406,
      "p_improvement": 0.99466308,
      "improved": false,
      "mde_at_power": 0.009881,
      "n_needed_for_margin": 204,
      "verdict": "FAIL",
      "reason": "significant_regression"
    },
    {
      "axis": "instruction",
      "n": 600,
      "counts": {
        "both_correct": 508,
        "ref_only": 8,
        "cand_only": 0,
        "both_wrong": 84
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      "acc_candidate": 0.846667,
      "regression_d": 0.013333,
      "d_ci": [
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      "d_upper_bound": 0.021667,
      "p_regression": 0.00390625,
      "p_regression_holm": 0.015625,
      "p_improvement": 1.0,
      "improved": false,
      "mde_at_power": 0.011701,
      "n_needed_for_margin": 204,
      "verdict": "FAIL",
      "reason": "significant_regression"
    },
    {
      "axis": "knowledge",
      "n": 400,
      "counts": {
        "both_correct": 367,
        "ref_only": 7,
        "cand_only": 2,
        "both_wrong": 24
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      "acc_reference": 0.935,
      "acc_candidate": 0.9225,
      "regression_d": 0.0125,
      "d_ci": [
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        0.0275
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      "d_upper_bound": 0.025,
      "p_regression": 0.08984375,
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      "mde_at_power": 0.0186,
      "n_needed_for_margin": 204,
      "verdict": "PASS",
      "reason": "non_inferior_within_margin"
    },
    {
      "axis": "reasoning",
      "n": 400,
      "counts": {
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        "ref_only": 2,
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      "p_improvement": 0.2265625,
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      "mde_at_power": 0.016404,
      "n_needed_for_margin": 204,
      "verdict": "PASS",
      "reason": "non_inferior_within_margin"
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  ],
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    "margin": 0.03,
    "alpha": 0.05,
    "n_floor": 30,
    "power": 0.8,
    "n_boot": 4000,
    "seed": 0
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}