The Driftproof receipt for code-review-and-quality on Claude Opus 5.5, from Report 011, dated 2026-09-23, and what it can say.
code-review-and-quality 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 severity-labeled-findings: the two arms' spreads sum to 0.232, at or above the 0.05 floor).
Skill token cost: +6975 input and +460 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.910 | no spread recorded | 1 |
| without the skill | 0.680 | no spread recorded | 1 |
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/report-011/code-review-and-quality-claude-opus-5-5-2026-09-23.json; run.transcripts records retained-local.
Receipt hash: 5c3ad19b40dd4b39bd73899709528f3547a77e84abf43e0707d3b6a4d76ea3b3
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-011/code-review-and-quality-claude-opus-5-5-2026-09-23.json
npx driftproof@0.28.0 validate code-review-and-quality-claude-opus-5-5-2026-09-23.json