{
  "sphragis_version": "0.1.0",
  "generated_at": "2026-07-27T16:17:13.291817+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": 237,
        "ref_only": 203,
        "cand_only": 88,
        "both_wrong": 872
      },
      "acc_reference": 0.314286,
      "acc_candidate": 0.232143,
      "regression_d": 0.082143,
      "d_ci": [
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      "d_upper_bound": 0.102857,
      "p_regression": 0.0,
      "p_regression_holm": 0.0,
      "p_improvement": 1.0,
      "improved": false,
      "mde_at_power": 0.030275,
      "n_needed_for_margin": 1426,
      "verdict": "FAIL",
      "reason": "significant_regression"
    },
    {
      "axis": "instruction",
      "n": 600,
      "counts": {
        "both_correct": 0,
        "ref_only": 11,
        "cand_only": 16,
        "both_wrong": 573
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      "acc_reference": 0.018333,
      "acc_candidate": 0.026667,
      "regression_d": -0.008333,
      "d_ci": [
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        0.008333
      ],
      "d_upper_bound": 0.005,
      "p_regression": 0.87610572,
      "p_regression_holm": 1.0,
      "p_improvement": 0.22103417,
      "improved": false,
      "mde_at_power": 0.021496,
      "n_needed_for_margin": 308,
      "verdict": "PASS",
      "reason": "non_inferior_within_margin"
    },
    {
      "axis": "knowledge",
      "n": 400,
      "counts": {
        "both_correct": 57,
        "ref_only": 67,
        "cand_only": 38,
        "both_wrong": 238
      },
      "acc_reference": 0.31,
      "acc_candidate": 0.2375,
      "regression_d": 0.0725,
      "d_ci": [
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        0.1225
      ],
      "d_upper_bound": 0.115,
      "p_regression": 0.00300804,
      "p_regression_holm": 0.00902412,
      "p_improvement": 0.99838951,
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      "mde_at_power": 0.063531,
      "n_needed_for_margin": 1802,
      "verdict": "FAIL",
      "reason": "significant_regression"
    },
    {
      "axis": "reasoning",
      "n": 400,
      "counts": {
        "both_correct": 50,
        "ref_only": 34,
        "cand_only": 35,
        "both_wrong": 281
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      "acc_reference": 0.21,
      "acc_candidate": 0.2125,
      "regression_d": -0.0025,
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        0.0375
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      "p_regression": 0.59502547,
      "p_regression_holm": 1.0,
      "p_improvement": 0.5,
      "improved": false,
      "mde_at_power": 0.051501,
      "n_needed_for_margin": 1183,
      "verdict": "INCONCLUSIVE",
      "reason": "ci_too_wide"
    }
  ],
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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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}