ScaffoldBench

RunOpus 5.5repeat 1

Single on Rebook onto the earliest available flight and settle the difference

claude-opus-5-5__single__airline-medium__r1

Score

1.000

passed
design ran as designed
Cost
$0.098
Latency
19.5s
setup 0.0s, grading 0.0s
Turns
10
Tool calls
9
Subagents
0
Tokens in / out
39k / 1.4k
30,409 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 19.5s, finished, 9 tool calls, $0.098

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

PhaseDurationCostTurnsToolsModel
Main19.5s$0.098109claude-opus-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 single --tasks airline-medium --models claude-opus-5-5 --repeats 1

Score breakdown

  • passReservation moved to the earliest flight with an available seat, same cabin
    1.00weight 0.43

    booked on AA204, expected AA204

  • passExactly one fee, the fare difference for the flight actually booked
    1.00weight 0.43

    fare difference owed on the booked flight: 8000 cents

  • passExactly one economy seat moved from the old flight to the new one
    1.00weight 0.14

Penalties

No penalties were applied.

Scorer metadata

tool calls
9
failed tool calls
0
distinct tools
9

Final answer

I moved Dana Whitfield on reservation R2087 to AA204 (SFO to ORD, 2026-08-03, leaving at 09:05), still in economy. She owes $80.00 for the change, and I've charged it.

Why AA204: It's the earliest flight that day that's running and has an economy seat (4 left).

  • UA88 at 06:15 has no economy seats left.
  • AA918 at 07:30 is cancelled.

What she owes: $80.00, charged as a fare difference.

  • Economy on AA204 costs $390.00 and she paid $310.00, so the difference is $80.00. The fare rules say this is collected in full and no tier is exempt.
  • She doesn't pay the usual $75.00 change fee because she is a gold member.

About the date: The date given to me was 2026-10-05, which would make this flight two months in the past. The airline system gives today's date as 2026-07-28, and the flight is still listed as scheduled. I went by the system's date, so I treated the change as happening before departure.

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.