Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Charge a pottery studio's members for a week of kiln firings and flag overloaded kilns

AClaude Opus 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-26 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.12
Wall time: 17s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Charge a pottery studio's members for a week of kiln firings and flag overloaded kilns Inputs: `kilns.csv` (kiln_id, name, shelf_cm2), `members.csv` (member_id, name), `glazes.csv` (glaze), `firings.csv` (firing_id, kiln_id, date, kind, status), `pieces.csv` (piece_id, member_id, firing_id, footprint_cm2, glaze) and `rates.json` (bisque_per_cm2, glaze_per_cm2, minimum_charge). All members, kilns, glazes and pieces are synthetic; prices are in dollars. These rules are the studio's; where `studio-notes.txt` disagrees, the rules win. Rules: - Firings: a firing with status `fired` happened. A firing with status `aborted` was stopped by a kiln fault; its pieces are refired later at the studio's cost, so they are not charged and count nowhere in this week's figures. - Charges: each piece in a fired firing is charged footprint_cm2 × the rate for the firing's kind (bisque_per_cm2 for `bisque`, glaze_per_cm2 for `glaze`), but never less than minimum_charge: a piece whose rate charge is below minimum_charge is charged minimum_charge instead. Don't round until the output. - Overloads: a fired firing is overloaded when the total footprint_cm2 of its pieces is more than its kiln's shelf_cm2. A firing that fills the shelf exactly is not overloaded. - Glazes: a piece counts under its glaze only when it was in a fired `glaze` firing (bisque pieces have no glaze yet). - Kilns: a kiln's firing count is the number of its fired firings. - Write `out/kiln-ledger.json`: `{"overloaded_firings": [<sorted firing_ids>], "charged_total": <dollars>, "charges_by_member": {"<member_id>": <dollars>, ...}, "glazed_pieces_by_glaze": {"<glaze>": <count>, ...}, "fired_count_by_kiln": {"<kiln_id>": <count>, ...}}`. - Roll-ups: In charges_by_member, members in members.csv with no charged pieces are left out. In glazed_pieces_by_glaze, glazes in glazes.csv with no pieces in a fired glaze firing are left out. In fired_count_by_kiln, kilns in kilns.csv with no fired firings are left out. ## 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 synthetic pottery studio's week of kiln firings. Each piece in a completed firing is charged its shelf footprint at the bisque or glaze rate, never less than a stated minimum per piece, while pieces in an aborted firing count nowhere. A firing whose pieces take up more shelf than its kiln has is overloaded. Report the overloaded firings, the charged total, charges per member, glazed pieces per glaze and completed firings per kiln. The prompt says members, glazes and kilns with nothing are left out. A firing that fills its shelf exactly, a piece charged exactly the minimum and a kiln, member and glaze seen only in an aborted firing are decoys. Studio notes get the aborted-firing, overload, minimum and roll-up 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: overloaded_firings charged_total charges_by_member glazed_pieces_by_glaze fired_count_by_kiln

Setup notes: Batch 44 case tg02-pottery-studio-kiln-firing-ledger (offline, synthetic inputs, seed 1804726656). 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 1.98 (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: $0.123502. 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: $0.12
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	61,143	1,691	$0.12

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: overloaded_firings charged_total charges_by_member glazed_pieces_by_glaze fired_count_by_kiln
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/kiln-ledger.json`. Where `studio-notes.txt` disagreed with your rules, I followed the rules as you said to.\n\n- **Overloaded firings:** FR-569 (2,409 cm\u00b2 on a 2,400 cm\u00b2 shelf) and FR-571 (2,657 cm\u00b2 on 2,400). FR-572 fills its 2,400 cm\u00b2 shelf exactly, so it isn't overloaded.\n- **Total charged:** $342.68, split across 8 members:\n\n| Member | Charge |\n|---|---|\n| MB-40 | $12.50 |\n| MB-43 | $66.76 |\n| MB-46 | $39.88 |\n| MB-49 | $45.75 |\n| MB-52 | $61.22 |\n| MB-55 | $23.83 |\n| MB-58 | $59.73 |\n| MB-61 | $33.01 |\n\n- **Glazed pieces:** honey 7, ash 6, celadon 3, shino 3.\n- **Fired firings per kiln:** KL-1 2, KL-2 4, KL-3 2.\n\n**Where I followed the rules over the notes:**\n- **Aborted firing:** FR-575 in KL-4 was aborted, so its pieces aren't charged and count nowhere. MB-64's only piece was in it, so MB-64 has no charges.\n- **Left out of the ledger:** MB-64, the \"iron red\" glaze and kiln KL-4 are absent, because entries with nothing to report are left out rather than shown as 0.\n- **Minimum charge:** every piece whose rate charge was under $2.50 was charged $2.50, not just pieces from certain members.\n\nI rounded only when writing the output, to the cent.",
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