Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Charge residents' parking permits by emission band, part year, household order and blue-badge exemption

AClaude Opus 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-23 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.12
Wall time: 24s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Charge a council's residents' parking permits for the rest of the scheme year Inputs: `permits.csv` (permit_id, household, reg, co2_gkm, fuel, start_date, cancelled_on, status), `charges.json`, `blue-badges.csv` (household) and `office-note.txt`. Amounts are in pounds. `charges.json` and these rules are the record; where the office note disagrees, the rules win. Rules: - Permits with status refused are ignored. Households match ignoring letter case and surrounding spaces; report them in upper case. - A car's band is the first band in charges.json whose max_co2 is at least co2_gkm (a car exactly on a limit stays in that band; max_co2 null is the top band). Electric cars are band "electric" and free. - Diesel cars add diesel_surcharge to the band's annual price. - A permit is charged annual price x days / days_in_year, counting days from start_date to cancelled_on (or scheme_year_end), both included. - In each household, non-electric permits are ordered by start_date (ties by the permit number); every permit after the first costs additional_permit_pct percent more. - A household in blue-badges.csv pays nothing for its first non-electric permit only. - Each permit's charge is rounded half-up to 0.01 at the end. Write `out/permits.json`: `{"band": {"<permit_id>": "<band>", ...}, "charge": {"<permit_id>": <charge>, ...}, "household_totals": {"<HOUSEHOLD>": <sum>, ...}, "total": <sum of charges>}` covering every permit that is not refused. ## 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.

Price a street's residents' parking permits for the rest of the scheme year. Cars sit exactly on band limits, diesel adds a surcharge, days are counted with both ends included, second permits cost more but permit numbers sort differently as text and as numbers, households are written in mixed case and spacing, and a blue badge only covers the first permit. An office note gets the band edge, day count and badge 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: bands pro_rata household_order_and_badges totals

Setup notes: Batch 30 case o02-residents-parking-permits (offline, synthetic inputs, seed 154206508). 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 0.51 (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: $0.118975. 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: 24s
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	58,247	1,994	$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: bands pro_rata household_order_and_badges totals
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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   "server_tool_use": {
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     "type": "message"
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   "speed": "standard",
   "fallback_credit": null
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  "modelUsage": {
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    "outputTokens": 1994,
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    "costUSD": 0.11897540000000001,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 224,
    "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,
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   "refused": {
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   "by_type": {}
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  "safety_stops": 0,
  "is_error": false,
  "num_turns": 3,
  "subtype": "success",
  "api_error_status": null,
  "result": "I've written `out/permits.json`. It covers the 9 permits that weren't refused, which total **\u00a3450.07**. The three refused permits (RP-21, RP-22, RP-24) are left out. I checked a few charges by hand against the formula, but nothing else was run against the output.\n\n| Household | Permits (band \u2192 charge) | Total |\n|---|---|---|\n| 32 BELL ST | RP-9 A \u2192 \u00a30.00 (blue badge), RP-35 C \u2192 \u00a3131.18, RP-15 electric \u2192 \u00a30.00 | \u00a3131.18 |\n| 3 FIR CLOSE | RP-8 B \u2192 \u00a30.00 (blue badge), RP-12 C diesel \u2192 \u00a3159.95, RP-7 C \u2192 \u00a377.92 | \u00a3237.87 |\n| 27 COBDEN RD | RP-23 A diesel \u2192 \u00a321.55 | \u00a321.55 |\n| 16 DALE AVE | RP-25 B \u2192 \u00a334.36 | \u00a334.36 |\n| 53 ASH GROVE | RP-18 A diesel \u2192 \u00a325.11 | \u00a325.11 |\n\nWhere the office note disagreed with the rules, I followed the rules:\n- **Band limits:** a car exactly on a limit stays in that band. So RP-8 at 160 g/km is band B and RP-18 at 100 g/km is band A, not the band above.\n- **Day count:** both the start and end dates are counted.\n- **Blue badges:** only the household's first non-electric permit is free, not all of its permits.\n\nTwo choices I made where the rules weren't explicit:\n- **Ordering ties:** RP-9 and RP-35 both start on 2026-11-19. I compared permit numbers as numbers, so RP-9 counts as the first permit and is the free blue-badge one. RP-35 is the second and pays 100% more. Comparing them as text would put RP-35 first and swap which one is charged.\n- **Electric cars:** they're free and don't count when deciding which permit is first or which ones pay extra.\n\nHousehold totals and the overall total are sums of the already-rounded permit charges.",
  "ttft_ms": 2185,
  "type": "result",
  "duration_ms": 23270,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1396,
  "time_to_request_ms": 296,
  "first_content_frame_ms": 1396,
  "queued_turn_count": 0,
  "result_index": 0
 }
]