The Driftproof receipt for hyperframes-animation on Claude Opus 5.5, dated 2026-10-18, and what it can say.
hyperframes-animation 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 | 0.939 | ± 0.106 | 3 |
| without the skill | 0.785 | ± 0.179 | 3 |
Lift +0.154, ± 0.208. 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/04191e2a7dc55d45bf187e6dfd9d7e5aa340cb1a2478bd15a3e65f5f3d37d2b2.json; run.transcripts records retained-local.
Receipt hash: 1c9ada1036b3c143c278438e008ac56df967a7132d863649e386e8d3c4664741
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/04191e2a7dc55d45bf187e6dfd9d7e5aa340cb1a2478bd15a3e65f5f3d37d2b2.json
npx driftproof@0.22.4 validate 04191e2a7dc55d45bf187e6dfd9d7e5aa340cb1a2478bd15a3e65f5f3d37d2b2.json