The Driftproof receipt for handoff on Claude Haiku 5.5, from Report 018, dated 2026-11-02, and what it can say.
handoff on claude-haiku-5-5
Not enough draws
Not enough draws to conclude at this effect floor.
Draws needed: no draw count at these spreads (case resume: the two arms' spreads sum to 0.079, at or above the 0.05 floor).
Skill token cost: +314 input and +181 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.818 | ± 0.088 | 3 |
| without the skill | 0.758 | ± 0.102 | 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.
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-3/535870454c90a44c05d5a0b2920d9f3895dd4a6f7513ea82c0f89387087d9786.json; run.transcripts records retained-local.
Receipt hash: 255186420fbabfe851c85b70f7768dad055ecd29fedd0c98b473a9edd181fe57
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-3/535870454c90a44c05d5a0b2920d9f3895dd4a6f7513ea82c0f89387087d9786.json
npx driftproof@0.27.0 validate 535870454c90a44c05d5a0b2920d9f3895dd4a6f7513ea82c0f89387087d9786.json