The Driftproof receipt for media-use on Claude Sonnet 5.5, dated 2026-11-01, and what it can say.
media-use on claude-sonnet-5-5
Passing
A case separated upward under the band rule. That is a separation detected under the rule, not proof that the skill moved the score.
Skill token cost: +3171 input and -2 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.897 | ± 0.045 | 3 |
| without the skill | 0.769 | ± 0.146 | 3 |
Lift +0.128, ± 0.153. 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.
This receipt also reads the skill against a same-length placebo. Report 017 shows that reading.
What was verified
receipt_hash verified when this page was built from receipts/report-017c/campaign-1/f2bb2e6fbec8d45ddbf0d7070b0c00672fbd1428dc4c6a9e4ff9d7929e477708.json; run.transcripts records retained-local.
Receipt hash: 9b55433e219fb065e304806bceea6aee214d3b3fb55eaa11244eef5ef5533586
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-017c/campaign-1/f2bb2e6fbec8d45ddbf0d7070b0c00672fbd1428dc4c6a9e4ff9d7929e477708.json
npx driftproof@0.27.0 validate f2bb2e6fbec8d45ddbf0d7070b0c00672fbd1428dc4c6a9e4ff9d7929e477708.json