Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Work out arrival times, layovers and tight connections for a multi-leg trip across time zones

AClaude Opus 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-20 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.11
Wall time: 16s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Work out a multi-leg trip itinerary across time zones Input: `itinerary.json`, a list of flight legs in travel order. Each leg has a local departure time (`depart_local`, wall-clock time at the departure airport), the departure and arrival time zones (IANA names) and the block time in minutes. Rules: - Arrival time = departure instant + duration_min, written as wall-clock time in the arrival airport's zone, format `YYYY-MM-DDTHH:MM`. - Use the real time-zone rules for the travel dates, including daylight-saving changes. - Layover = minutes from a leg's arrival to the next leg's departure (real elapsed minutes). - A connection is tight when its layover is under 60 minutes. - total_elapsed_min = real minutes from the first departure to the last arrival. - date_change_legs = the legs whose local arrival date differs from their local departure date, in travel order. Write `out/itinerary.json`: `{"arrivals": {"<leg>": "<YYYY-MM-DDTHH:MM>", ...}, "layovers_min": {"<leg>": <int>, ...}, "tight": [<leg>, ...], "total_elapsed_min": <int>, "date_change_legs": [<leg>, ...]}` `layovers_min` and `tight` are keyed by the leg that arrives before the connection (every leg except the last), and `tight` is in travel order. ## 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 4-6 flight legs given in local departure times and block minutes into local arrival times, layovers, tight-connection flags, total trip time and date-change legs. The travel window spans the late-October and early-November daylight-saving changes, and routes include half-hour and 45-minute offset zones. Departures that fall on ambiguous or skipped local times are redrawn. 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: arrival_local_times dst_rules_applied layover_minutes tight_connections total_elapsed date_change_legs

Setup notes: Batch 16 case r02-timezone-itinerary (offline, synthetic inputs, seed 2149826149). 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 0.43 (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: $0.105875. Score: 6/6. 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: 16s
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	57,289	1,542	$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: arrival_local_times dst_rules_applied layover_minutes tight_connections total_elapsed date_change_legs
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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    "provider": "firstParty",
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  "permission_denials": [],
  "terminal_reason": "completed",
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  "subagent_stats": {
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  "result": "I've written `out/itinerary.json`. Times were converted with Python's built-in time-zone rules for the actual travel dates, and every departure time exists exactly once on the local clock.\n\n| Leg | Route | Arrives (local) | Layover before next leg |\n|---|---|---|---|\n| L1 | ORD\u2192LAX | 2026-10-26T16:15 | 185 min |\n| L2 | LAX\u2192AKL | 2026-10-28T04:45 | 95 min |\n| L3 | AKL\u2192LHR | 2026-10-28T00:40 | **57 min (tight)** |\n| L4 | LHR\u2192JFK | 2026-10-28T05:12 | **52 min (tight)** |\n| L5 | JFK\u2192FRA | 2026-10-28T20:34 | 338 min |\n| L6 | FRA\u2192KTM | 2026-10-29T19:02 | \u2014 (last leg) |\n\n- **Tight connections:** L3 and L4.\n- **Total elapsed time:** 3,832 minutes, from the first departure to the last arrival.\n- **Date-change legs:** only L2. L3 lands the same calendar day it leaves.\n\n**Daylight saving:** London and Frankfurt switched back to winter time on 25 Oct, before the trip. Chicago, Los Angeles and New York don't switch until 1 Nov, so they're still on summer time. Auckland is on its summer time, 13 hours ahead of UTC. Kathmandu has no DST and sits at UTC+5:45.\n\n**Odd data:** a 440-minute AKL\u2192LHR flight isn't realistic. I used the figures as given, since the inputs are synthetic.",
  "ttft_ms": 2520,
  "type": "result",
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  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1480,
  "time_to_request_ms": 255,
  "first_content_frame_ms": 1480,
  "queued_turn_count": 0,
  "result_index": 0
 }
]