The Driftproof receipt for hyperframes-registry on Claude Opus 5.5, dated 2026-10-18, and what it can say.
hyperframes-registry on claude-opus-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.
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.972 | ± 0.035 | 3 |
| without the skill | 0.618 | ± 0.222 | 3 |
Lift +0.354, ± 0.224. 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/skill-measurements/published/075aadf10079f38c704b46df04fb5e34803608ffe765d995f9fb7fe57ec92df8.json; run.transcripts records retained-local.
Receipt hash: 32028d8d47628e683aebec2f14ebe378154d595e983a50e11c08962ce41184f8
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/skill-measurements/published/075aadf10079f38c704b46df04fb5e34803608ffe765d995f9fb7fe57ec92df8.json
npx driftproof@0.22.4 validate 075aadf10079f38c704b46df04fb5e34803608ffe765d995f9fb7fe57ec92df8.json