Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on Prepare a charity's quarterly tax-relief claim on donations with reach-back declarations, cancellations, company gifts and donor benefits

AClaude Sonnet 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: $0.06
Wall time: 13s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Prepare a small charity's gift aid claim for the quarter Inputs: `donations.csv` (every donation received July to September 2026: donor, date, amount, donor type and the value of any benefit the donor received in return) and `declarations.csv` (gift aid declarations donors have signed, with any cancellation date). Every amount is in pounds. This is a made-up scheme for this task; follow these rules, not any real tax rules. Claim rules: - A donation is covered only if its donor has a declaration whose declaration_date is no more than 4 years after the donation date (declarations reach back up to 4 years, and cover everything after), and, if that declaration has a cancelled_date, the donation was made before the cancelled_date. - Donations from companies (donor_type 'company') are never eligible. - A donation where the donor received a benefit is eligible only if benefit_value is no more than 25% of the amount; otherwise none of it is eligible. - Gift aid = 25% of each donor's total eligible donations, rounded half-up to the cent per donor. Write `out/claim.json`: `{"covered": {"<donation_id>": true|false, ...} for every donation from an individual (whether a declaration covers it, ignoring the benefit rule), "benefit_ok": {"<donation_id>": true|false, ...} for every donation from an individual with a benefit_value, "eligible_total": {"<donor_id>": <sum of that donor's eligible donations>, ...}, "gift_aid": {"<donor_id>": <gift aid>, ...}, "claim_total": <sum of the per-donor gift aid figures>}` listing only donors with at least one eligible donation. ## 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.

Work out a small charity's claim on a quarter's donations under a made-up relief scheme. Declarations reach back four years, a cancellation stops cover from its date, company gifts never qualify, a donation with a benefit over a quarter of its value is excluded, and the claim is 25% of each donor's eligible total rounded per donor. Ignoring reach-back, cancellations or benefits each change the claim. 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: declaration_reach_back cancellation benefit_limit companies_and_gift_aid

Setup notes: Batch 24 case z05-gift-aid-claim (offline, synthetic inputs, seed 530431703). 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 0.26 (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: $0.056023. 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: $0.06
Wall time: 13s
Human step-ins: 0
Turns: 4

Model usage
Model	Input tok	Output tok	Cost
AClaude Sonnet 5.5anthropic/claude-sonnet-5.5effort default (no --effort flag) · thinking on	78,240	1,549	$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: declaration_reach_back cancellation benefit_limit companies_and_gift_aid
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 wrote `out/claim.json`. The claim total is **\u00a3111.99** across seven donors.\n\n| Donor | Eligible total (\u00a3) | Gift aid (\u00a3) |\n|---|---|---|\n| DN313 | 55.00 | 13.75 |\n| DN352 | 70.00 | 17.50 |\n| DN362 | 25.00 | 6.25 |\n| DN368 | 110.00 | 27.50 |\n| DN347 | 5.00 | 1.25 |\n| DN323 | 132.95 | 33.24 |\n| DN304 | 50.00 | 12.50 |\n\nI read the rules like this:\n- **Later declarations count:** a declaration dated after the donation still covers it, as long as it is dated no more than 4 years after the donation. That is how DN313 and DN352 qualify, with declarations dated in October 2026 for donations made in July to September.\n- **Cancellation:** the donation must be strictly before the cancelled date.\n- **Benefit rule:** the benefit counts as fine when it is at most 25% of the amount, and a blank benefit is treated as no benefit. `benefit_ok` lists only donations with a benefit value.\n- **Excluded:** the company donations from DN335 are left out of `covered` and `benefit_ok`.\n- **DN316:** this donor has no eligible donations and so is not in `eligible_total` or `gift_aid`. Both donations are covered, but each has a benefit above 25% of its amount.\n- **DN374:** this donor has no declaration, so their donation is not covered.",
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]