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Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Bill a freelancer's clients for a month with half days, weekend rates, marked-up expenses and prepaid retainers

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

Trust 80%Fully autonomoussuccess · first try
Estimated cost
$0.12
Wall time
16s
Human step-ins
0
Outcome
Pass

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Summary

Exact prompt

# Bill a freelancer's clients for October Inputs: `timelog.csv` (hours logged per client per day in October 2026), `clients.json` (each client's day rate and the retainer they have already paid in advance) and `expenses.csv` (re-chargeable expenses; mileage rows give miles instead of an amount). Every amount is in pounds. Billing rules, per client: - A day with 4 hours or more logged for a client is a full day; under 4 hours is a half day. Add up a client's hours per date first. - Days on a Saturday or Sunday are charged at 1.5x the day rate. - Expenses are re-charged at cost plus 10%, except mileage, which is charged at 0.45 per mile with no markup. Round each expense line to the cent half-up. - Deduct the client's retainer from fees plus expenses, but never below zero; any unused retainer carries forward. Write `out/invoices.json`: `{"days_charged": {"<client>": <full-day equivalents, e.g. 3.5>, ...}, "fees": {"<client>": <day-rate charges>, ...}, "expenses": {"<client>": <re-charged expenses>, ...}, "amount_due": {...}, "carry_forward": {"<client>": <unused retainer>, ...}}` with every client in `clients.json` (a client with nothing logged has 0 everywhere except carry_forward). ## 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.

Turn a month of logged hours and expenses into client invoices. Hours are summed per day and billed as half or full days, weekend days cost 1.5x, expenses carry a 10% markup except mileage at a flat per-mile rate, and prepaid retainers are deducted with any surplus carried forward. Billing hours pro rata, skipping the weekend rate or marking up mileage 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: half_days weekend_rate expense_markup retainer

Setup notes: Batch 24 case z02-freelance-monthly-invoices (offline, synthetic inputs, seed 1050317085). 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: $0.116027. 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
$0.12
Wall time
16s
Human step-ins
0
Turns
3
Model usage
ModelInput tokOutput tokCost
AClaude Opus 5.5anthropic/claude-opus-5.5effort default (no --effort flag) · thinking on58,5421,752$0.12

Reproduce this run

  1. Use the use case prompt on the use case page.
  2. 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.
  3. It counts as a success only if it meets every success criterion: half_days weekend_rate expense_markup retainer
  4. 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

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Evidence log
[
 {
  "duration_api_ms": 14883,
  "stop_reason": "end_turn",
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  "total_cost_usd": 0.1160274,
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   "output_tokens_details": {
    "thinking_tokens": 144
   },
   "server_tool_use": {
    "web_search_requests": 0,
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   "service_tier": "standard",
   "cache_creation": {
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     "cache_creation": {
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     },
     "type": "message"
    }
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   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
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    "cacheReadInputTokens": 49657,
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    "webSearchRequests": 0,
    "costUSD": 0.1160274,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 144,
    "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,
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   "completed": 0,
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   "killed": {
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  "safety_stops": 0,
  "is_error": false,
  "num_turns": 3,
  "subtype": "success",
  "api_error_status": null,
  "result": "I've written `out/invoices.json` with all six clients from `clients.json`. I hand-checked a couple of the expense lines; there is no separate test run.\n\n| Client | Days | Fees | Expenses | Amount due | Carry forward |\n|---|---|---|---|---|---|\n| Odd Socks Bakery | 4.0 | 2635.00 | 107.81 | 242.81 | 0 |\n| Quarry Lane Garage | 4.0 | 1750.00 | 52.20 | 0 | 4197.80 |\n| Ferncliff Dental | 5.5 | 3840.00 | 8.15 | 3848.15 | 0 |\n| Mabel & Finch | 4.0 | 2467.50 | 31.50 | 2499.00 | 0 |\n| Northgate Lettings | 3.5 | 1912.50 | 79.16 | 0 | 508.34 |\n| Tinworth Brewery | 0 | 0 | 0 | 0 | 500.00 |\n\n- **Hours per date:** I added up each client's hours per date before deciding full or half day. This matters on several dates: two 3-hour entries for Quarry Lane Garage on 4 October make one full day, not two half days.\n- **Long days:** a day counts as at most one full day, however many hours are logged.\n- **Weekend rate:** Saturdays and Sundays are charged at 1.5x the day rate, for half days as well as full days.\n- **Expenses:** each line is rounded to the cent half-up before adding them up. For example, Odd Socks Bakery is \u00a372.71 for the train fare plus \u00a335.10 for 78 miles, giving \u00a3107.81.\n- **Tinworth Brewery:** they logged no hours and no expenses, so their whole \u00a3500 retainer carries forward.\n\nThe script that produced this is at `/tmp/bill.py`, outside `out/`.",
  "ttft_ms": 2112,
  "type": "result",
  "duration_ms": 15215,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 875,
  "time_to_request_ms": 233,
  "first_content_frame_ms": 876,
  "queued_turn_count": 0,
  "result_index": 0
 }
]

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