ScaffoldBench

RunSonnet 5.5repeat 2

Plan-execute-verify on Cancel a fare the customer wrongly believes is refundable to their card

claude-sonnet-5-5__plan-execute-verify__airline-hard__r2

Score

1.000

passed
design ran as designed
Cost
$0.061
Latency
24.1s
setup 0.0s, grading 0.0s
Turns
16
Tool calls
11
Subagents
0
Tokens in / out
52k / 2.2k
41,738 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.
  • The plan was a plan: heldplan-execute-verify.planThe planner’s reply was read through its schema and held at least one step.
  • Every verdict was read: heldplan-execute-verify.verdictsEvery review round ended with a verdict read from the schema reply, not a default.
  • The loop did what its verdicts said: heldplan-execute-verify.loopEvery verdict that called for a revision got one, and nothing was revised without such a verdict.
  • Each call was shown the right tools: heldplan-execute-verify.toolsThe planner was shown no tools, the verifier the read-only ones, and the executor and reviser the full toolset.

Phases

Plan: 0.0s to 7.5s, finished, 0 tool calls, $0.011
Execute: 7.5s to 18.0s, finished, 6 tool calls, $0.029
Verify: 18.0s to 24.1s, finished, 5 tool calls, $0.020

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

PhaseDurationCostTurnsToolsModel
Plan7.5s$0.01120claude-sonnet-5-5
Execute10.5s$0.02976claude-sonnet-5-5
Verify6.1s$0.02075claude-sonnet-5-5

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 plan-execute-verify --tasks airline-hard --models claude-sonnet-5-5 --repeats 1

Score breakdown

  • passReservation is cancelled
    1.00weight 0.29
  • passSettled with exactly one ledger entry, in the right form and for the right amount
    1.00weight 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
11
failed tool calls
0
distinct tools
7

Final answer

Reservation R3311 is cancelled, but you're getting $248.00 in travel credit, not $248 back on your card.

  • Why it's credit: Your basic economy fare is non-refundable on its own. Your trip insurance does override that. But the insurance only pays back to your card if you cancel at least 14 days before departure. The refund system's date for this booking is 2026-07-28, which is 8 days before the 2026-08-05 flight. Inside that window, the insurance turns the fare into travel credit instead.
  • Fee: The $50 cancellation service fee is waived because you're a platinum member. The credit is the full $248.00.
  • What I did: I cancelled R3311, which released the seat, and made one ledger entry (L1) for $248.00 in travel credit. I changed no other booking or record.
  • Date discrepancy: My task context gave today's date as 2026-10-06, but the refund policy for this booking used 2026-07-28. I followed the policy date, and the flight was still scheduled.

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.