ScaffoldBench

RunSonnet 5.5repeat 1

Plan-execute on Rebook onto the earliest available flight and settle the difference

claude-sonnet-5-5__plan-execute__airline-medium__r1

Score

1.000

passed
design ran as designed
Cost
$0.061
Latency
23.5s
setup 0.0s, grading 0.0s
Turns
13
Tool calls
10
Subagents
0
Tokens in / out
55k / 2.3k
45,467 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.planThe planner’s reply was read through its schema and held at least one step.
  • Each call was shown the right tools: heldplan-execute.toolsThe planner was shown no tools and the executor the task’s full toolset.

Phases

Plan: 0.0s to 9.3s, finished, 0 tool calls, $0.018
Execute: 9.3s to 23.5s, finished, 10 tool calls, $0.044

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

PhaseDurationCostTurnsToolsModel
Plan9.3s$0.01820claude-sonnet-5-5
Execute14.2s$0.0441110claude-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 --tasks airline-medium --models claude-sonnet-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
10
failed tool calls
0
distinct tools
8

Final answer

Dana is now on AA204, SFO to ORD on 2026-08-03, departing 09:05. She stays in economy, and she owes $80.00 for the change.

  • Why this flight: UA88 (06:15) has no economy seats left, and AA918 (07:30) is cancelled. AA204 is the earliest flight that day with an economy seat. It had 4 left, and I confirmed that before booking.
  • Change fee: $0. The economy change fee is $75, but Dana is gold tier, and gold is exempt.
  • Fare difference: $80.00. AA204 economy costs $390 and she paid $310. Fare rules say the difference is collected in full, and no tier is exempt from it. I recorded it as one fare_difference entry on R2087 (L1, $80.00).
  • Other records: I changed nothing else. R2087 now shows AA204, and the ledger has just that one entry.

The system's current date is 2026-10-05, which is after this flight's date of 2026-08-03. You asked for the move, so I made it, but you may want to check the dates on this booking.

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.