ScaffoldBench

RunOpus 5.5repeat 1

Propose-select on Add checked bags and collect the right fee

claude-opus-5-5__propose-select__airline-easy__r1

Score

1.000

passed
design ran as designed
Cost
$0.351
Latency
47.1s
setup 0.0s, grading 0.0s
Turns
31
Tool calls
25
Subagents
3
Tokens in / out
98k / 6.7k
64,697 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.
  • All three proposers ran: heldpropose-select.proposalsThree proposers ran in parallel, each from its own angle, and none was starved while another ran.
  • The selector chose: heldpropose-select.selectionThe selector picked a proposal by a valid number, read from its schema reply and not a default.
  • Each call was shown the right tools: heldpropose-select.toolsEach proposer was shown the read-only tools, the selector none, and the executor the full toolset.

Phases

Proposal 1 (policy-first): 0.0s to 18.8s, finished, 6 tool calls, $0.074
Proposal 2 (state-first): 0.0s to 17.1s, finished, 5 tool calls, $0.065
Proposal 3 (outcome-first): 0.0s to 18.8s, finished, 6 tool calls, $0.075
Select: 18.8s to 31.4s, finished, 0 tool calls, $0.065
Execute: 31.4s to 47.1s, finished, 8 tool calls, $0.072

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

PhaseDurationCostTurnsToolsModel
Proposal 1 (policy-first)18.8s$0.07476claude-opus-5-5
Proposal 2 (state-first)17.1s$0.06565claude-opus-5-5
Proposal 3 (outcome-first)18.8s$0.07576claude-opus-5-5
Select12.6s$0.06520claude-opus-5-5
Execute15.7s$0.07298claude-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 propose-select --tasks airline-easy --models claude-opus-5-5 --repeats 1

Score breakdown

  • passReservation holds three checked bags and is otherwise untouched
    1.00weight 0.43

    checked_bags=3, status=confirmed

  • passExactly one baggage fee, for the bags beyond the free allowance
    1.00weight 0.57

    expected 4500 cents for 1 chargeable bag(s), charged 4500

Penalties

No penalties were applied.

Scorer metadata

tool calls
25
failed tool calls
0
distinct tools
8

Final answer

I added Rosa Mendel's two bags to reservation R1042, so she now has 3 checked bags. I charged her $45.00 for them as a single baggage fee.

What I changed:

  • Bags: R1042 went from 1 checked bag to 3.
  • Fee: one baggage fee of $45.00 on R1042. This is the only charge on the booking, and it had no earlier charges.

Why she owes $45 and not $120:

  • She is booked in economy, which comes with 1 free bag. Her silver frequent-flyer status adds a second, so she gets 2 free bags.
  • With 3 bags in total, only 1 is beyond her free allowance. It costs $45, the published price for the first extra bag.
  • The $75 price only applies to a second paid bag, which she doesn't have. So $120 ($45 + $75) would overcharge her.

What to tell Rosa: "Your reservation now has 3 checked bags. Your fare includes 1 free bag and your silver status adds a second, so one of the two new bags is free. The other costs $45. 3 bags is the most a reservation can hold, so you can't add any more."

About the date: this session says today is 2026-10-05, which would mean her 2026-08-11 SFO→Seattle flight has already gone. The airline system says today is 2026-07-28 and lists the flight as scheduled, so I went with the system's date.

I didn't change anything else on her booking, her passenger record or the flight.

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.