The Driftproof receipt for CLAUDE.md on Claude Haiku 5.5, from Report 016, dated 2026-10-27, and what it can say.
CLAUDE.md on claude-haiku-5-5
Not measured
This receipt carries no verdict: its run is marked incomplete.
Skill token cost: +11739 input and +663 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.974 | ± 0.115 | 19 |
| without the skill | 0.989 | ± 0.046 | 19 |
No lift is stated for a state that did not measure one. A spread is the sample standard deviation of the per-case means: a descriptive spread with no coverage probability. The verdict above reads each case's two bands, not these aggregates.
What was verified
receipt_hash verified when this page was built from receipts/report-016/receipt-1d569adc36a7.json; run.transcripts records retained-local.
Receipt hash: 1d569adc36a72c710a18330004bddaa39219d0476be7f919cb04d2d11c429800
Check this file yourself
validate shows that this file is unchanged since it was sealed. It does not show who made it or who sealed it.
curl -fsSLO https://raw.githubusercontent.com/driftproofhq/driftproof/main/receipts/report-016/receipt-1d569adc36a7.json
npx driftproof@0.28.0 validate receipt-1d569adc36a7.json