ScaffoldBench

RunHaiku 4.5repeat 2

Single on Cancel a fare the customer wrongly believes is refundable to their card

claude-haiku-4-5-20251001__single__airline-hard__r2

Score

0.429

wrong answer
design ran as designed
Cost
$0.035
Latency
30.4s
setup 0.0s, grading 0.0s
Turns
6
Tool calls
5
Subagents
0
Tokens in / out
30k / 2.8k
17,967 read from cache

Did the design run?

every check held
  • Run completed: heldharness.run-completedThe environment was built, the architecture returned and grading finished, none of them throwing.
  • No API failures: heldharness.apiNo model call failed at the API.
  • Every call ended: heldharness.calls-endedEvery call ended with a result, or was stopped by the run's own limits.
  • No harness tool denied: heldharness.harness-toolsThe sandbox guard never denied a harness tool, nor a tool the session itself offered.
  • Tool servers connected: heldharness.mcp-connectedEvery tool server the harness gave a call was connected when the session started.
  • No foreign tool servers: heldharness.mcp-hermeticNo call loaded a tool server the harness did not give it.
  • Builtin tools: heldharness.builtin-toolsA check recorded with the run.
  • Structured replies arrived: heldharness.structured-outputEvery call that asked for structured output and ran to the end got it.
  • No silent fallbacks: heldharness.not-degradedNo phase fell back on a default (an empty plan, a default winner) instead of its output.
  • Each call was shown the right tools: heldsingle.toolsThe agent was shown exactly the task’s tools, none missing and none extra.

Phases

Main: 0.0s to 30.4s, finished, 5 tool calls, $0.035

Drawn from the phase records: timing and cost per call, no tool calls or messages.

PhaseDurationCostTurnsToolsModel
Main30.4s$0.03565claude-haiku-4-5-20251001

The call-by-call replay is not published for this run. Traces are large, so the repository keeps 9 of this run set’s 900 and leaves the rest out; the score, phases and final answer on this page come from the committed run record.

Runs you can replay

Record this cell yourself: npm run bench -- run --strategies single --tasks airline-hard --models claude-haiku-4-5-20251001 --repeats 1

Score breakdown

  • passReservation is cancelled
    1.00weight 0.29
  • failSettled with exactly one ledger entry, in the right form and for the right amount
    0.00weight 0.57

    expected a single travel_credit entry of 24800 cents; ledger holds 1 entries

  • passThe cancelled seat went back into inventory
    1.00weight 0.14

Penalties

No penalties were applied.

Scorer metadata

tool calls
5
failed tool calls
0
distinct tools
5

Final answer

Summary

I have cancelled reservation R3311 and settled it as follows:

What was requested: Marcus Bell asked for the full $248 refund to be returned to his card, citing his trip insurance purchase.

What the rules require: The reservation cannot be refunded. Here's why:

  • The flight (AA660 to Boston) departed on 2026-08-05
  • Today is 2026-10-02 — the flight already flew about 58 days ago
  • Per the refund policy (Rule 7): Once a trip has been flown, only unflown segments are refundable
  • Trip insurance (Rule 3) only covers cancellations made within 14 days before departure; that window has long passed
  • Therefore, the $248 fare is non-refundable

Actions taken:

  1. ✓ Cancelled reservation R3311
  2. ✓ Recorded it as non-refundable with an explanation of the reason

Marcus Bell will not receive a refund. The booking is closed.

Provenance of the numbers on this page

run set
scaffold-or-scale-v1
models
Haiku 4.5, Sonnet 5.5, Opus 5.5
effort
high
repeats
2
fixtures
replay
runs
900 / 900
strategy cost
$354.44
judge cost
$9.19
wall clock
9h 48m
git
fce5807b2d

Cost excludes judge calls, which are tracked separately so a scoring model never flatters or penalises an architecture. Every figure on this site is read from results/ at build time.