The Driftproof receipt for media-use on Claude Haiku 5.5, from Report 018, dated 2026-11-02, and what it can say.
media-use on claude-haiku-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.
Skill token cost: +3170 input and +163 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.846 | ± 0.154 | 3 |
| without the skill | 0.740 | ± 0.181 | 3 |
Lift +0.106, ± 0.238. 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.
This receipt also reads the skill against a same-length placebo. Report 018 shows that reading.
What was verified
receipt_hash verified when this page was built from receipts/report-018/campaign-3/df0981cc067afdab06c17e35cd97b32dc3bfae5fb2e5cc5d88cf027138a865ae.json; run.transcripts records retained-local.
Receipt hash: 2c37963a2ebaf2d367acf79e65d71090dd748c7fc852e8e1f603caef2f7f1af8
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-018/campaign-3/df0981cc067afdab06c17e35cd97b32dc3bfae5fb2e5cc5d88cf027138a865ae.json
npx driftproof@0.27.0 validate df0981cc067afdab06c17e35cd97b32dc3bfae5fb2e5cc5d88cf027138a865ae.json