{
  "$schema": "../../schema/benchmark.schema.json",
  "benchmark_id": "zod--claude-opus-5--bm1--2026-09-07",
  "preregistration": "prompts/benchmark.md",
  "library": {
    "name": "zod",
    "ecosystem": "npm",
    "graded_against": "4.5.4",
    "installed_on": "2026-09-07",
    "bisected": true,
    "bisect_journal": "JOURNAL/067"
  },
  "subject": {
    "id": "claude-opus-5",
    "label": "Claude Opus 5",
    "vendor": "Anthropic",
    "invoked_as": "Agent tool subagent, model opus, one fresh subagent per cell with no memory of any other cell; the retry rounds of a cell continue that same subagent. Delivery per prompts/benchmark.md §14.",
    "self_reported_cutoff": null,
    "measured_boundary": "4.1.0",
    "self_test": true
  },
  "protocol": {
    "date": "2026-09-07",
    "arms": [
      {
        "name": "BARE",
        "context_file": null,
        "context_words": 0,
        "context_chars": 0
      },
      {
        "name": "PACK",
        "context_file": "corrections/zod.md",
        "context_words": 7396,
        "context_chars": 51247,
        "context_sha256": "69fdf7aef666f789fddb5bf807130342a42fc9d3226605df12fd9fd8074800c6"
      },
      {
        "name": "PLACEBO",
        "context_file": "corrections/tailwindcss.md",
        "context_words": 7732,
        "context_chars": 57591,
        "context_sha256": "e11695781ff7d455d69fbfd37b41b20011e099ce9183c0819dcc24466a51966e"
      }
    ],
    "draws_per_arm": 2,
    "retry_cap": 3,
    "grader": "node",
    "class_ratio": {
      "A": 2,
      "N": 1
    },
    "delivery": {
      "mechanism": "file-read",
      "wrapper_file": "prompts/sent/benchmark-delivery-wrapper.txt",
      "wrapper_sha256": "e38afc301a1d53bd9089cff2cf366729821a4a771526420be7aed377e470fba4",
      "tool_use_selfreport": true,
      "note": "The runner writes each round's exact bytes; the subject is sent this wrapper and reads that file. Rejected alternative: pasting the bytes into the spawn, which would have the operator re-emitting a 51,247-character pack from its own context 36 times, where silent drift is unfalsifiable. The wrapper is byte-identical across arms apart from the path it names, and its rendered characters are billed to every round. A correction round is delivered as the conversation so far, file by file, because this harness cannot hand a running subagent another turn: recorded in prompts/benchmark.md §14 as a correction, made after the first failing cell and before any cell had a second round.",
      "wrapper_retry_file": "prompts/sent/benchmark-delivery-wrapper-retry.txt",
      "wrapper_retry_sha256": "87b0f3ab692e7d2f3cb149827b2a8e689ae003bc4a89b56ab028282fc4588ef1"
    },
    "token_unit_note": "Characters and words are exact and complete for this sample. input_tokens and output_tokens are null throughout: the Agent-tool transport reports no provider token counts to the operator, this repo has no tokenizer and takes no dependency, and an estimated token count printed beside a measured one is a number nobody can check. B2's break-even is quoted in characters or not quoted.",
    "deviations": [
      "PLACEBO is corrections/tailwindcss.md, not the corrections/next.js.md named in the pre-registration §5. Two reasons, recorded 2026-09-07 before any arm ran (prompts/benchmark.md §5 amendment): the next.js pack names zod three times, including two open-questions entries about model boundaries ON ZOD, so it is not a zod-free control; and §5's own size rule now selects tailwindcss, because the zod pack grew from 5,384 to 7,396 words as the data lane corrected it (tailwindcss 7,732 words, +4.5%; next.js 5,560, -24.8%).",
      "The subject is the same model as the operator (subject.self_test true). Disclosed rather than avoided: the studio has no independent Opus 5 to spawn."
    ]
  },
  "tasks": [
    {
      "id": "A1",
      "class": "A",
      "fact_id": "LF3",
      "severity": "S1",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a1.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A1",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
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          "4.0.17",
          "4.1.0",
          "4.1.6",
          "4.1.13",
          "4.2.0",
          "4.2.1",
          "4.3.0",
          "4.3.1",
          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
          "4.5.0",
          "4.5.4"
        ],
        "shape": "falling",
        "artifact": "tools/benchmark/tasks/zod/A1.stale.mjs",
        "boundary": "4.4.0",
        "correct_reference": "tools/benchmark/tasks/zod/A1.reference.mjs",
        "correct_passes_from": "4.0.0",
        "contiguous": true
      }
    },
    {
      "id": "A2",
      "class": "A",
      "fact_id": "LF1",
      "severity": "S1",
      "previously_charged": true,
      "prompt_file": "prompts/sent/benchmark-zod-a2.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A2",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
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          "4.2.0",
          "4.2.1",
          "4.3.0",
          "4.3.1",
          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
          "4.5.0",
          "4.5.4"
        ],
        "shape": "falling",
        "artifact": "tools/benchmark/tasks/zod/A2.stale.mjs",
        "boundary": "4.3.0",
        "correct_reference": "tools/benchmark/tasks/zod/A2.reference.mjs",
        "correct_passes_from": "4.0.0",
        "contiguous": true
      }
    },
    {
      "id": "A3",
      "class": "A",
      "fact_id": "LF10",
      "severity": "S2",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a3.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A3",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
          "4.0.0",
          "4.0.17",
          "4.1.0",
          "4.1.6",
          "4.1.13",
          "4.2.0",
          "4.2.1",
          "4.3.0",
          "4.3.1",
          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
          "4.5.0",
          "4.5.4"
        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A3.reference.mjs",
        "boundary": "4.4.0",
        "correct_reference": "tools/benchmark/tasks/zod/A3.reference.mjs",
        "correct_passes_from": "4.4.0",
        "contiguous": true
      }
    },
    {
      "id": "A4",
      "class": "A",
      "fact_id": "LF15",
      "severity": "S2",
      "previously_charged": true,
      "prompt_file": "prompts/sent/benchmark-zod-a4.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A4",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
          "4.0.0",
          "4.0.17",
          "4.1.0",
          "4.1.6",
          "4.1.13",
          "4.2.0",
          "4.2.1",
          "4.3.0",
          "4.3.1",
          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
          "4.5.0",
          "4.5.4"
        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A4.reference.mjs",
        "boundary": "4.3.0",
        "correct_reference": "tools/benchmark/tasks/zod/A4.reference.mjs",
        "correct_passes_from": "4.3.0",
        "contiguous": true
      }
    },
    {
      "id": "A5",
      "class": "A",
      "fact_id": "LF9",
      "severity": "S2",
      "previously_charged": true,
      "prompt_file": "prompts/sent/benchmark-zod-a5.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A5",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
          "4.0.0",
          "4.0.17",
          "4.1.0",
          "4.1.6",
          "4.1.13",
          "4.2.0",
          "4.2.1",
          "4.3.0",
          "4.3.1",
          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
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          "4.5.4"
        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A5.reference.mjs",
        "boundary": "4.4.0",
        "correct_reference": "tools/benchmark/tasks/zod/A5.reference.mjs",
        "correct_passes_from": "4.4.0",
        "contiguous": true
      }
    },
    {
      "id": "A6",
      "class": "A",
      "fact_id": "LF17",
      "severity": "S2",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a6.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A6",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
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          "4.0.17",
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          "4.3.6",
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        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A6.reference.mjs",
        "boundary": "4.1.13",
        "correct_reference": "tools/benchmark/tasks/zod/A6.reference.mjs",
        "correct_passes_from": "4.1.13",
        "contiguous": true
      }
    },
    {
      "id": "A7",
      "class": "A",
      "fact_id": "LF8",
      "severity": "S2",
      "previously_charged": true,
      "prompt_file": "prompts/sent/benchmark-zod-a7.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A7",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
          "4.0.0",
          "4.0.17",
          "4.1.0",
          "4.1.6",
          "4.1.13",
          "4.2.0",
          "4.2.1",
          "4.3.0",
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          "4.3.6",
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        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A7.reference.mjs",
        "boundary": "4.4.0",
        "correct_reference": "tools/benchmark/tasks/zod/A7.reference.mjs",
        "correct_passes_from": "4.4.0",
        "contiguous": true
      }
    },
    {
      "id": "A8",
      "class": "A",
      "fact_id": "LF7",
      "severity": "S2",
      "previously_charged": true,
      "prompt_file": "prompts/sent/benchmark-zod-a8.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A8",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
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          "4.0.17",
          "4.1.0",
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          "4.1.13",
          "4.2.0",
          "4.2.1",
          "4.3.0",
          "4.3.1",
          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
          "4.5.0",
          "4.5.4"
        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A8.reference.mjs",
        "boundary": "4.2.0",
        "correct_reference": "tools/benchmark/tasks/zod/A8.reference.mjs",
        "correct_passes_from": "4.2.0",
        "contiguous": true
      }
    },
    {
      "id": "A9",
      "class": "A",
      "fact_id": "LF20",
      "severity": "S2",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a9.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A9",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
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          "4.0.17",
          "4.1.0",
          "4.1.6",
          "4.1.13",
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          "4.3.6",
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          "4.5.4"
        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A9.reference.mjs",
        "boundary": "4.3.2",
        "correct_reference": "tools/benchmark/tasks/zod/A9.reference.mjs",
        "correct_passes_from": "4.3.2",
        "contiguous": true
      }
    },
    {
      "id": "A10",
      "class": "A",
      "fact_id": "LF18",
      "severity": "S3",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a10.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A10",
        "kind": "exec"
      },
      "flip_test": {
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          "4.3.6",
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        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A10.reference.mjs",
        "boundary": "4.4.0",
        "correct_reference": "tools/benchmark/tasks/zod/A10.reference.mjs",
        "correct_passes_from": "4.4.0",
        "contiguous": true
      }
    },
    {
      "id": "A11",
      "class": "A",
      "fact_id": "LF19",
      "severity": "S3",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a11.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A11",
        "kind": "exec"
      },
      "flip_test": {
        "ladder": [
          "4.0.0",
          "4.0.17",
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          "4.3.6",
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        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A11.reference.mjs",
        "boundary": "4.3.0",
        "correct_reference": "tools/benchmark/tasks/zod/A11.reference.mjs",
        "correct_passes_from": "4.3.0",
        "contiguous": true
      }
    },
    {
      "id": "A12",
      "class": "A",
      "fact_id": "LF12",
      "severity": "S3",
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-a12.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "A12",
        "kind": "exec"
      },
      "flip_test": {
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          "4.3.0",
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          "4.3.2",
          "4.3.6",
          "4.4.0",
          "4.4.3",
          "4.5.0",
          "4.5.4"
        ],
        "shape": "rising",
        "artifact": "tools/benchmark/tasks/zod/A12.reference.mjs",
        "boundary": "4.4.0",
        "correct_reference": "tools/benchmark/tasks/zod/A12.reference.mjs",
        "correct_passes_from": "4.4.0",
        "contiguous": true
      }
    },
    {
      "id": "N1",
      "class": "N",
      "fact_id": null,
      "severity": null,
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-n1.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "N1",
        "kind": "exec"
      },
      "flip_test": {
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        ],
        "shape": "null",
        "artifact": "tools/benchmark/tasks/zod/N1.reference.mjs",
        "boundary": null,
        "correct_reference": "tools/benchmark/tasks/zod/N1.reference.mjs",
        "correct_passes_from": "4.0.0",
        "contiguous": true
      }
    },
    {
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      "class": "N",
      "fact_id": null,
      "severity": null,
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-n2.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "N2",
        "kind": "exec"
      },
      "flip_test": {
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        ],
        "shape": "null",
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        "boundary": null,
        "correct_reference": "tools/benchmark/tasks/zod/N2.reference.mjs",
        "correct_passes_from": "4.0.0",
        "contiguous": true
      }
    },
    {
      "id": "N3",
      "class": "N",
      "fact_id": null,
      "severity": null,
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-n3.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "N3",
        "kind": "exec"
      },
      "flip_test": {
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          "4.1.13",
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        ],
        "shape": "null",
        "artifact": "tools/benchmark/tasks/zod/N3.reference.mjs",
        "boundary": null,
        "correct_reference": "tools/benchmark/tasks/zod/N3.reference.mjs",
        "correct_passes_from": "4.0.0",
        "contiguous": true
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    },
    {
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      "class": "N",
      "fact_id": null,
      "severity": null,
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-n4.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "N4",
        "kind": "exec"
      },
      "flip_test": {
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          "4.1.13",
          "4.2.0",
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        ],
        "shape": "null",
        "artifact": "tools/benchmark/tasks/zod/N4.reference.mjs",
        "boundary": null,
        "correct_reference": "tools/benchmark/tasks/zod/N4.reference.mjs",
        "correct_passes_from": "4.0.0",
        "contiguous": true
      }
    },
    {
      "id": "N5",
      "class": "N",
      "fact_id": null,
      "severity": null,
      "previously_charged": false,
      "prompt_file": "prompts/sent/benchmark-zod-n5.txt",
      "assertion": {
        "module": "tools/benchmark/tasks/zod.mjs",
        "export": "N5",
        "kind": "exec"
      },
      "flip_test": {
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      ]
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  ],
  "summary": "BM1 is complete: 106 graded cells of 108 planned (one excluded for a self-reported tool use, one abandoned in transcription). Every arm passed every cell it was graded on - BARE 36/36, PACK 35/35, PLACEBO 35/35 - so the terminal pass rate does not distinguish the arms and B1, that PACK passes more Class A tasks than BARE, is falsified. Before any correction round, PACK passed 23 of 23 Class A cells against BARE 22 of 24 and PLACEBO 20 of 23. Thirteen correction rounds were spent in the entire run and twelve of them belong to one task, A6 (zod 4.1.13 own slug transform), which PACK answered at round 0 in both draws while BARE and PLACEBO each ran to the pre-registered cap. B2 is confirmed against our own product: a PACK cell cost a mean 53,733 characters against BARE 4,496, and even billing the pack once per session rather than once per task it would need about 28 fact-dependent tasks to repay itself against BARE measured retry overhead of 1,799 characters per cell, against the roughly 12 pre-registered. B3 held: PLACEBO tracked BARE rather than PACK on both pass rate and correction rounds, so the pack single measured effect is not context bulk. B4 is falsified: harm is zero, with all six Class N tasks passing in every arm at round 0. B5 holds, on the strength of A6 alone.",
  "journal": "JOURNAL/083"
}
