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The Driftproof receipt for grilling on Claude Opus 5.5, dated 2026-10-18, and what it can say.

grilling on claude-opus-5-5

Run on 2026-10-18, runner 0.22.2, surface claude-cli, verification level TESTED.

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.

driftproof badge: passing on claude-opus-5-5, 2026-10-18

The two arms

armmeanspread across casescases
with the skill0.832± 0.1893
without the skill0.686± 0.1433

Lift +0.146, ± 0.237. 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.

The two arms of this receipt drawn as ranges, with the effect floor marked. 0 0.25 0.5 0.75 1 overlapping without the skill 0.686 with the skill 0.832

What was verified

receipt_hash verified when this page was built from receipts/skill-measurements/published/5640b4df7ca5298c51ad73a3ab199a8e6a3ee018bb90fd2a449a1323ecdeade7.json; run.transcripts records retained-local.

Receipt hash: 03481240e4efc76f244fe2118a578362caa6ed0ff28ade7d7f9de4e9247d7adc

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/5640b4df7ca5298c51ad73a3ab199a8e6a3ee018bb90fd2a449a1323ecdeade7.json

npx driftproof@0.22.4 validate 5640b4df7ca5298c51ad73a3ab199a8e6a3ee018bb90fd2a449a1323ecdeade7.json

Embed the badge

[![driftproof](https://driftproofhq.com/r/03481240e4efc76f244fe2118a578362caa6ed0ff28ade7d7f9de4e9247d7adc/badge.svg)](https://driftproofhq.com/r/03481240e4efc76f244fe2118a578362caa6ed0ff28ade7d7f9de4e9247d7adc/)