The Driftproof receipt for tdd on Claude Opus 5.5, dated 2026-10-18, and what it can say.
tdd 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 agreement: the two arms' spreads sum to 0.128, at or above the 0.05 floor).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 1.000 | ± 0.000 | 3 |
| without the skill | 0.969 | ± 0.053 | 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/e20ea3cfccc4f094125ed7bd434ec74e18e62da66face7ab67daddcac39753c7.json; run.transcripts records retained-local.
Receipt hash: d0c2dca3389eac037ade15ade45c633abbdc1fa431bd09264c705d01c48eaf28
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/e20ea3cfccc4f094125ed7bd434ec74e18e62da66face7ab67daddcac39753c7.json
npx driftproof@0.22.4 validate e20ea3cfccc4f094125ed7bd434ec74e18e62da66face7ab67daddcac39753c7.json