{
  "sphragis_version": "0.1.0",
  "generated_at": "2026-07-27T18:34:00.914337+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": 393,
        "ref_only": 53,
        "cand_only": 28,
        "both_wrong": 926
      },
      "acc_reference": 0.318571,
      "acc_candidate": 0.300714,
      "regression_d": 0.017857,
      "d_ci": [
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        0.030714
      ],
      "d_upper_bound": 0.028571,
      "p_regression": 0.00363775,
      "p_regression_holm": 0.01091325,
      "p_improvement": 0.99820183,
      "improved": false,
      "mde_at_power": 0.015973,
      "n_needed_for_margin": 396,
      "verdict": "FAIL",
      "reason": "significant_regression"
    },
    {
      "axis": "instruction",
      "n": 600,
      "counts": {
        "both_correct": 45,
        "ref_only": 0,
        "cand_only": 0,
        "both_wrong": 555
      },
      "acc_reference": 0.075,
      "acc_candidate": 0.075,
      "regression_d": 0.0,
      "d_ci": [
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        0.0
      ],
      "d_upper_bound": 0.0,
      "p_regression": 1.0,
      "p_regression_holm": 1.0,
      "p_improvement": 1.0,
      "improved": false,
      "mde_at_power": null,
      "n_needed_for_margin": 204,
      "verdict": "PASS",
      "reason": "non_inferior_within_margin"
    },
    {
      "axis": "knowledge",
      "n": 400,
      "counts": {
        "both_correct": 67,
        "ref_only": 8,
        "cand_only": 1,
        "both_wrong": 324
      },
      "acc_reference": 0.1875,
      "acc_candidate": 0.17,
      "regression_d": 0.0175,
      "d_ci": [
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        0.0325
      ],
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      "p_regression": 0.01953125,
      "p_regression_holm": 0.0390625,
      "p_improvement": 0.99804688,
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      "mde_at_power": 0.0186,
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      "verdict": "FAIL",
      "reason": "significant_regression"
    },
    {
      "axis": "reasoning",
      "n": 400,
      "counts": {
        "both_correct": 128,
        "ref_only": 35,
        "cand_only": 8,
        "both_wrong": 229
      },
      "acc_reference": 0.4075,
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      "d_ci": [
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      "d_upper_bound": 0.095,
      "p_regression": 2.097e-05,
      "p_regression_holm": 8.387e-05,
      "p_improvement": 0.99999552,
      "improved": false,
      "mde_at_power": 0.040656,
      "n_needed_for_margin": 737,
      "verdict": "FAIL",
      "reason": "significant_regression"
    }
  ],
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    "margin": 0.03,
    "alpha": 0.05,
    "n_floor": 30,
    "power": 0.8,
    "n_boot": 4000,
    "seed": 0
  }
}