Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Invoice a nursery's families for a month with weekly funded hours, a term-start age rule and a sibling discount

AClaude Opus 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-22 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.15
Wall time: 30s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Invoice a nursery's families for October 2026 Inputs: `children.csv` (child id, family id, date of birth), `attendance.csv` (hours each child attended each day in October 2026) and `fees.json`. Invoice rules: - Funded hours: a child who was 3 or older on 2026-09-01 gets up to `funded_hours_per_week` hours free in each Monday-to-Sunday week (the part-week 1-4 October counts as a week); unused funded hours don't carry to another week. - Charged hours = attended hours minus funded hours used; hours fee = charged hours x `hourly_rate`. - Sibling discount: `sibling_discount_pct` off the hours fee (not meals) of every child in a family except the oldest child who attended in October. - Meals: `meal_per_day` for each day attended. - Each child's total = hours fee after discount + meals, rounded half-up to the cent. A family's total is the sum of its children's rounded totals. Write `out/invoices.json`: `{"funded_hours_used": {"<child_id>": <hours>, ...}, "child_totals": {"<child_id>": <total>, ...}, "family_totals": {"<family_id>": <total>, ...}}` for every child and family that attended in October. ## How this run works - Work on your own: nobody will answer questions in this task, and writing to `ask/` counts against the run. - Write only under `out/`. Create `out/` if it is missing. Inputs are synthetic; don't fetch anything from the network. - Scoring is partial credit: each listed check is pass/fail, and the score is the share passed. Numbers are compared to within 0.005 unless the task says otherwise.

Bill each family at a day nursery for October from daily attendance. Children aged 3 by the start of term get a weekly allowance of free hours that does not roll over, younger siblings get a discount on their hours fee but not their meals, and totals are rounded per child. Pooling the free hours over the month, judging age on the invoice date or skipping the sibling discount each change the invoices. Original benchmark task written for usecaserank.com (not based on a specific public post). Headless, offline run on a reproducible fixture. Each run's notes say how its cost was measured (estimates are marked).

Success criteria: funded_weekly eligibility_date sibling_discount child_totals

Setup notes: Batch 23 case y04-nursery-funded-hours (offline, synthetic inputs, seed 201813934). Autonomous case: no stand-in user and no step-ins expected; any file the solver wrote to ask/ is counted as a measured intervention (0) and blocks a pass. Prompt = TASK.md verbatim. Hidden key kept outside the solver's work dir. Scored with the case's scorer (python3 score.py WORKDIR KEYDIR, absolute paths); pass = every check true and no ask/ files. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. 1-min load average at scoring 0.41 (8 cores). Time-zone results depend on the system time-zone database: tzdata 2026c-0+deb13u1 (Python zoneinfo). Claude Code's own reported cost for claude-opus-5.5: $0.146519. Score: 4/4. Cost is an ESTIMATE: measured tokens x pricing.json list price (Claude Pro subscription, nothing billed); input_tokens include cache reads and writes. Single run.

Estimated cost List-price estimate; not actually billed.

Metrics

Estimated cost: $0.15
Wall time: 30s
Human step-ins: 0
Turns: 5

Model usage
Model	Input tok	Output tok	Cost
AClaude Opus 5.5anthropic/claude-opus-5.5effort default (no --effort flag) · thinking on	99,868	2,572	$0.15

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Opus 5.5 (anthropic/claude-opus-5.5, effort default (no --effort flag) · thinking on) via Claude Code 2.1.299 (headless -p), cloud.
It counts as a success only if it meets every success criterion: funded_weekly eligibility_date sibling_discount child_totals
Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.

How runs are scored: Methodology.

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Automated checks

Trust 80% comes from these checks (how Trust % works).

Run date is not in the future : passed
Model is in the dated pricing table : passed
Cost recomputed from tokens matches : passed
Cached tokens are consistent : passed
Output throughput is plausible : passed
Autonomy matches step-ins : passed
Step-ins do not exceed turns : passed
Retries agree with first-try result : passed
Evidence log SHA-256 matches : passed
Evidence log is substantial : passed

Evidence log

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  "result": "I've written `out/invoices.json`. It covers the 13 children and 7 families who attended in October. The inputs were clean: no repeated child-and-date rows, no dates outside October, no unknown children and no zero-hour rows. I spot-checked a few totals by hand, but nothing else was available to check the output against.\n\n| Family | Total |\n|---|---|\n| F172 | 973.67 |\n| F301 | 541.59 |\n| F576 | 959.58 |\n| F600 | 959.22 |\n| F895 | 106.00 |\n| F963 | 627.34 |\n| F964 | 1070.25 |\n\nHow I applied the rules where they left room for interpretation:\n\n- **Funded hours:** a child qualifies if they had turned 3 by 2026-09-01, so born on or before 2023-09-01. Nine children qualify. C343, C353, C366 and C376 are too young and get no funded hours.\n- **Weeks:** Monday to Sunday. October splits into 1\u20134, 5\u201311, 12\u201318, 19\u201325 and 26\u201331. In each week a qualifying child gets up to 15 free hours. Unused hours are lost, so a full month uses at most 75.\n- **Sibling discount:** 12% off the hours fee of every child except the oldest in the family who attended. Only-child families get no discount. C378 (F600) had no October attendance, so they aren't on the invoice and don't count when picking F600's oldest child.\n- **Money:** calculated with exact decimals, with each child's total rounded half-up to the cent. Family totals are the sum of those rounded child totals.\n\nOne example: C373 is the oldest in F576 and all their hours fit within the funded allowance, so they pay only meals: 9 days \u00d7 \u00a32.40 = \u00a321.60.\n\nThe script I used is `/tmp/inv.py`, outside the work folder.",
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