The Driftproof receipt for grilling on Claude Sonnet 5.5, dated 2026-11-01, and what it can say.
grilling 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: +665 input and +131 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.657 | ± 0.205 | 3 |
| without the skill | 0.670 | ± 0.098 | 3 |
Lift -0.013, ± 0.228. 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-1/9c065800c643bb92c5767d90cedff42cfefdc2e4baab94b92759188eb2f34451.json; run.transcripts records retained-local.
Receipt hash: 667515dbf9bc6f239ba757bf64e0f301488eb7dfe30d2ce1bbb6c3231890a6e3
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-1/9c065800c643bb92c5767d90cedff42cfefdc2e4baab94b92759188eb2f34451.json
npx driftproof@0.27.0 validate 9c065800c643bb92c5767d90cedff42cfefdc2e4baab94b92759188eb2f34451.json