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Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Break down a home's electricity use by appliance from one plug's power readings and flag the faulty appliance

AClaude Haiku 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-25 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first try
Estimated cost
$0.0046
Wall time
16s
Human step-ins
0
Outcome
Pass

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Summary

Exact prompt

# Break down a home's electricity use by appliance from one plug's power readings and flag the faulty appliance Inputs: `power.csv` (t, watts: one reading per second from a single monitoring plug, t from 0) and `appliances.csv` (appliance_id, name, rated_w) for the appliances behind that plug. The home, the appliances and the readings are synthetic; the readings include a steady always-on load and random meter noise of a few watts. These rules are the household's; where `meter-notes.txt` disagrees, the rules win. Rules: - Events: a switch event happens at second t when |watts[t] − watts[t−1]| is 30 W or more. Its step is median(watts[t] … watts[t+8]) − median(watts[t−9] … watts[t−1]) (nine readings after and nine before, both medians of whole watts); a positive step is a switch-on and a negative step a switch-off. - Matching: an event belongs to the appliance whose rated_w R satisfies 0.75 × R ≤ |step| ≤ 1.5 × R (the ratings are spaced so that exactly one fits). Each switch-off ends that appliance's current on-period, which started at its last switch-on. - Use: an appliance's on_count is its number of switch-ons, its on_seconds the total of (switch-off t − switch-on t) over its on-periods, and its energy_wh the sum over its on-periods of the switch-on step × the period's seconds ÷ 3600. energy_wh is compared to within 0.5 Wh; on_count, on_seconds and faulty must match exactly. - Faulty: an appliance is faulty when any of its switch-on steps is more than 15% above its rated_w (step > 1.15 × rated_w). - Write `out/appliances.json`: `{"on_count": {"<appliance_id>": <n>, ...}, "on_seconds": {"<appliance_id>": <s>, ...}, "energy_wh": {"<appliance_id>": <Wh>, ...}, "faulty": [<sorted appliance_ids>]}`. - Roll-ups: Appliances in appliances.csv that never switch on are included at 0. ## 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.

Split one monitoring plug's second-by-second power readings for a synthetic home into its appliances. The readings carry an always-on load and seeded meter noise; switch events, step sizes (medians of nine readings each side), the matching window around each rating and the 0.5 Wh energy tolerance are all stated. One appliance develops a fault and starts drawing well over its rating. The prompt says appliances that never switch on are listed at 0. Meter notes get the step, fault 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: on_count on_seconds energy_wh faulty idle_appliances

Setup notes: Batch 40 case tn02-home-plug-power-breakdown (offline, synthetic inputs, seed 1832616786). 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 0.05 (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-haiku-5.5: $0.004624. 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
$0.0046
Wall time
16s
Human step-ins
0
Turns
5
Model usage
ModelInput tokOutput tokCost
AClaude Haiku 5.5anthropic/claude-haiku-5.5effort default (no --effort flag) · thinking on108,1122,813$0.0046

Reproduce this run

  1. Use the use case prompt on the use case page.
  2. Same setup: Claude Haiku 5.5 (anthropic/claude-haiku-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: on_count on_seconds energy_wh faulty idle_appliances
  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
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  "result": "I wrote `out/appliances.json` and it parses. AP-12 (Games console) is the only faulty appliance.\n\n| Appliance | on_count | on_seconds | energy_wh |\n|---|---|---|---|\n| AP-12 Games console | 4 | 2428 | 114.740556 |\n| AP-15 Sewing machine | 3 | 2254 | 258.415556 |\n| AP-47 Microwave | 0 | 0 | 0.0 |\n| AP-75 Desk lamp | 2 | 2095 | 32.307778 |\n| AP-76 Washing machine heater | 4 | 2131 | 1439.440278 |\n\n- **Faulty:** `[\"AP-12\"]`. Its switch-on step exceeds 1.15 \u00d7 170 W.\n- **Events:** 26 switch events were detected. All matched exactly one appliance, none fell too close to the edges to have full windows, and no period was left open at the end of the data.\n- **Microwave:** it never switches on, so it is included at zero.\n\nI followed the rules in `TASK.md` over `meter-notes.txt`, which disagrees on three points. The notes would use the raw reading-to-reading jump as the step, bill each appliance at rated watts, and skip appliances that never ran. The rules call for the median-window step, energy from the measured step, and zero-filled roll-ups.\n\nThe calculation script is in `/tmp/plug_calc/calc.py`, outside the work directory. Nothing was written to `ask/`.",
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 }
]

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