The Driftproof receipt for frontend-design on Claude Opus 5.5, dated 2026-10-18, and what it can say.
frontend-design on claude-opus-5-5
Not enough draws
Not enough draws to conclude at this effect floor.
Draws needed: no draw count at these spreads (case identity: the two arms' spreads sum to 0.134, at or above the 0.05 floor).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.933 | ± 0.058 | 3 |
| without the skill | 0.893 | ± 0.029 | 3 |
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/skill-measurements/published/08d68ce76a6d418465663497d85ec53b5a3f63c55c183652639f491876d3f753.json; run.transcripts records retained-local.
Receipt hash: 6c3b2df1b3af70c5c052710268f8307ba687a6045d585f826a7b03c7216c5c49
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/08d68ce76a6d418465663497d85ec53b5a3f63c55c183652639f491876d3f753.json
npx driftproof@0.22.4 validate 08d68ce76a6d418465663497d85ec53b5a3f63c55c183652639f491876d3f753.json