Claude Opus 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 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: $0.11
Wall time: 17s
Human step-ins: 0
Outcome: Pass

Compare with other models on this task →

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 62431599). 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 1.09 (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: $0.110158. 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: $0.11
Wall time: 17s
Human step-ins: 0
Turns: 3

Model usage
Model	Input tok	Output tok	Cost
AClaude Opus 5.5anthropic/claude-opus-5.5effort default (no --effort flag) · thinking on	57,474	1,734	$0.11

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: 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.

Was this useful?

⇄ Rerun on another model

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

[
 {
  "duration_api_ms": 15963,
  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
  "total_cost_usd": 0.1101576,
  "usage": {
   "input_tokens": 6,
   "cache_creation_input_tokens": 8200,
   "cache_read_input_tokens": 49268,
   "output_tokens": 1734,
   "output_tokens_details": {
    "thinking_tokens": 166
   },
   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
   },
   "service_tier": "standard",
   "cache_creation": {
    "ephemeral_1h_input_tokens": 8200,
    "ephemeral_5m_input_tokens": 0
   },
   "inference_geo": "global",
   "iterations": [
    {
     "input_tokens": 2,
     "output_tokens": 723,
     "cache_read_input_tokens": 18986,
     "cache_creation_input_tokens": 1360,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 1360
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-opus-5-5": {
    "inputTokens": 6,
    "outputTokens": 1734,
    "cacheReadInputTokens": 49268,
    "cacheCreationInputTokens": 8200,
    "webSearchRequests": 0,
    "costUSD": 0.1101576,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 166,
    "canonicalModel": "claude-opus-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
   "spawned": 0,
   "requested": {
    "background": 0,
    "foreground": 0,
    "unset": 0
   },
   "started_in_background": 0,
   "max_depth": 0,
   "spawned_by_subagents": 0,
   "completed": 0,
   "failed": 0,
   "killed": {
    "parent": 0,
    "user": 0,
    "system": 0
   },
   "refused": {
    "depth_limit": 0,
    "concurrency_limit": 0,
    "budget": 0
   },
   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 3,
  "subtype": "success",
  "api_error_status": null,
  "result": "I've written the claim to `out/claim.json`. The total gift aid for July to September 2026 is **\u00a388.54**, spread across 8 donors.\n\n| Donor | Eligible total | Gift aid |\n|---|---|---|\n| DN301 | 50.00 | 12.50 |\n| DN307 | 90.00 | 22.50 |\n| DN314 | 20.00 | 5.00 |\n| DN324 | 21.33 | 5.33 |\n| DN347 | 30.00 | 7.50 |\n| DN353 | 82.84 | 20.71 |\n| DN360 | 10.00 | 2.50 |\n| DN366 | 50.00 | 12.50 |\n\n**Excluded donations:**\n- **Company donations:** All of DN341's donations (G9011, G9012, G9013) are left out because they came from a company. The file doesn't list them under `covered`, as the spec asks.\n- **Made on or after a cancellation:**\n  - DN314's declaration was cancelled on 25 August 2026, so G9007 (3 September) isn't covered, but G9008 (22 July) is.\n  - DN360's declaration was cancelled on 14 August 2026, so G9019 and G9021 (both in September) aren't covered, but G9020 (21 July) is.\n- **No declaration:** DN333 hasn't signed one, so G9010 isn't covered. That donation would also fail the benefit rule anyway: the benefit was \u00a323.28 on a \u00a377.59 gift, which is more than 25%.\n\n**Declarations signed after the donation:** Some donors (DN307, DN324, DN353, DN366) signed their declaration later than some or all of their donations. Declarations reach back up to 4 years, so those donations still count.\n\n**Benefit passed:** G9018 passes because the \u00a31.25 benefit is exactly 25% of the \u00a35.00 donation, and the rule allows up to 25%.\n\nEach donor's gift aid is rounded half-up to the penny using exact decimal arithmetic, and the claim total is the sum of those rounded figures.",
  "ttft_ms": 2092,
  "type": "result",
  "duration_ms": 16311,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1051,
  "time_to_request_ms": 258,
  "first_content_frame_ms": 1052,
  "queued_turn_count": 0,
  "result_index": 0
 }
]