Datasets:
Phase 4 audit completion — 23 October 2026
All 150 judgments are complete and scored, under amendment
P4-AI-AUDIT-2026-10-23. These are AI-reviewed; not independently
human-validated. They must not be described as human or fully blind judgments.
| Condition | Clone | Not clone | Unsure | AI-reviewed rate; not independently human-validated | Wilson 95% | Rate including unsure |
|---|---|---|---|---|---|---|
| C4: filtered BM25 | 6 | 42 | 2 | 12% | 5.6–23.8% | 16% |
| C5: filtered random | 0 | 50 | 0 | 0% | 0–7.1% | 0% |
| C6: filtered semantic | 11 | 38 | 1 | 22% | 12.8–35.2% | 24% |
Wilson intervals quantify sampling uncertainty only. They do not account for AI-review error, shared systematic mistakes, or knowledge of benchmark outcomes. There is one AI reviewer and no measured inter-rater agreement.
What the results permit
- C4 is below the registered 42% ceiling but not contamination-free. The voided C3=C4 same-rate comparison is removed, not restored.
- C5's point estimate is within the predicted 0–2% band. Zero observed clones does not demonstrate that its population contamination is at most 2%; its sampling upper limit is 7.1%. Keep C1 as the report/demo headline condition.
- C6's point estimate is below the predicted 25–35% band, but its interval overlaps that band. Neither mechanism explanation is independently confirmed. Retain the observed scorer/F1 rescue; withdraw the stronger claim that it isolates similarity from contamination dose.
The original numeric bands and scorer-state-first endpoint ordering are unchanged. Comparisons to earlier human C2/C3 audits use different reviewer methods and cannot be treated as controlled contamination comparisons.
Evidence and verification
The completed CSVs (phase4_ai_review_c4.csv, phase4_ai_review_c5.csv,
phase4_ai_review_c6.csv) contain one pair-specific functional rationale and
reviewer/amendment attribution per judgment. The original blank pack is retained.
Labels were frozen at 2026-10-23 11:38:33 UTC, before joining audit keys or
calculating rates. phase4_ai_audit_freeze.json commits their SHA-256 hashes.
phase4_ai_audit_protocol.json preserves the original pre-label amendment,
including its historical pending status; this completion report supersedes that
status without changing the committed protocol file.
For each condition, all 50 IDs exactly match the fixed sheet and reproduce its
seed-13 sample; all keys match current mining triples. Result provenance records
the label, sheet, protocol and freeze hashes. Score-bound outcome records are
in sanitycheck.md §9.9. Modified scoring refuses altered frozen labels,
missing rationales and missing AI attribution in the amended closure gate.
Additionally, all 300 code fragments match the key-indexed canonical corpus text. The focused audit/scoring and closure suite passed 23 tests (three unrelated evaluation/checkpoint tests were deselected locally). This is separate from the earlier 165-test Colab run; no new full-suite pass is claimed.
The audit is complete. Full-project closure additionally requires reconciliation of the combined benchmark/generalisation table and remaining paper claims; audit completion alone is not proof those separate tasks are finished.