Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on Settle a property manager's security deposits on move-out with interest, final-month proration, allowed deductions and a statement deadline

AClaude Sonnet 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-24 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.06
Wall time: 13s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Settle a property manager's security deposits on move-out with interest, final-month proration, allowed deductions and a statement deadline Inputs: `tenancies.csv` (tenancy_id, unit, move_in, move_out, monthly_rent, deposit, final_month_paid, statement_sent), `charges.csv` (charge_id, tenancy_id, type, item, amount), `move-in-report.csv` (unit, item: conditions already recorded when the tenant moved in) and `deposit-rules.json` (interest_rate_pct, cleaning_cap, statement_days). All tenants and units are synthetic; amounts are in dollars. These rules are the record; where `leasing-note.txt` disagrees, the rules win. Rules: - Interest: deposit × interest_rate_pct / 100 × whole months held / 12, rounded half-up to the cent. Whole months held = the number of monthly anniversaries of move_in (same day number in a later month) that fall on or before move_out. - Final month: the rent owed for the move-out month is monthly_rent × (move_out's day number) / (number of days in that month), rounded half-up to the cent; final_rent_due = that amount − final_month_paid (negative means the tenant overpaid and is owed the difference). - Deductions: a charge of type wear is never deducted. A damage charge is deducted only if its item is not listed for the same unit in move-in-report.csv. Cleaning charges are deducted up to cleaning_cap in total per tenancy. unpaid_rent charges are always deducted. - Late statement: if statement_sent is more than statement_days days after move_out, nothing from charges.csv may be deducted for that tenancy (deductions = 0); final_rent_due still applies. - Balance: refund = deposit + interest − deductions − final_rent_due. If that is negative, report refund 0 and balance_due = the shortfall; otherwise balance_due is 0. - Write `out/deposits.json`: `{"tenancies": {"<tenancy_id>": {"interest": <dollars>, "final_rent_due": <dollars>, "deductions": <dollars>, "refund": <dollars>, "balance_due": <dollars>}, ...}, "total_refunded": <sum of refund>}`. ## 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.

Settle the security deposits of synthetic tenants who moved out of a managed building. Interest accrues by whole monthly anniversaries, the final month's rent is prorated by the move-out day, normal wear and conditions on the move-in report are never deducted, cleaning is capped per tenancy, and a statement sent after the deadline voids every deduction. Statements land exactly on and one day past the deadline. A leasing note gets the proration, interest, wear and deadline rules wrong. 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: interest final_month deductions late_statement balance

Setup notes: Batch 35 case tw02-property-deposit-dispositions (offline, synthetic inputs, seed 647819807). 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 0.50 (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-sonnet-5.5: $0.06031. Score: 5/5. 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: $0.06
Wall time: 13s
Human step-ins: 0
Turns: 3

Model usage
Model	Input tok	Output tok	Cost
AClaude Sonnet 5.5anthropic/claude-sonnet-5.5effort default (no --effort flag) · thinking on	60,533	1,849	$0.06

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Sonnet 5.5 (anthropic/claude-sonnet-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: interest final_month deductions late_statement balance
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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  "permission_denials": [],
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  "result": "I've written the settlements for all six tenancies to `out/deposits.json`. The total refunded is $7,687.71. I haven't checked the figures by hand beyond reading the output.\n\n| Tenancy | Interest | Final rent due | Deductions | Refund | Balance due |\n|---|---|---|---|---|---|\n| TY-334 | 23.77 | 520.00 | 0.00 | 478.77 | 0.00 |\n| TY-896 | 148.50 | 1,485.00 | 1,178.45 | 0.00 | 39.95 |\n| TY-104 | 137.16 | 1,862.90 | 150.00 | 1,974.26 | 0.00 |\n| TY-541 | 112.22 | 1,016.13 | 114.43 | 556.66 | 0.00 |\n| TY-274 | 216.75 | 1,261.29 | 0.00 | 2,355.46 | 0.00 |\n| TY-269 | 68.53 | \u2212104.03 | 0.00 | 2,322.56 | 0.00 |\n\n- **Late statements:** TY-334, TY-274 and TY-269 were sent more than 21 days after move-out, so their deductions are 0. TY-896, TY-104 and TY-541 were sent exactly 21 days after, which is on time.\n- **Overpayment:** TY-269 overpaid its final month, so the 104.03 owed back is added to its refund.\n- **Shortfall:** TY-896's deductions exceed its deposit plus interest after final rent, so its refund is 0 and it owes 39.95.\n- **Leasing note:** I followed `deposit-rules.json` and ignored `leasing-note.txt` where they disagree, as the task says. That means final-month rent is prorated, wear charges are excluded and the 21-day deadline is enforced.",
  "ttft_ms": 1786,
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 }
]