CLAUDE-SONNET-5 · 20260723-v2-library

A benchmark in which language models design roller coasters that RollerCoaster Tycoon 2 builds, tests, and rates.

claude-sonnet-5 · 3rd of 3 compare all models →

library · wooden · driver-api · library mode — models may search the stock track design library, which measures retrieval and adaptation; copies score zero

excitementintensity×build failed
0515intensity ceiling 10excitementintensityR1R2R3R4R5R6
score
6.30
intensity
8.29
nausea
4.62
best round
6
rated rounds
6/6
similarity
0.35
tokens / cost
—
Studied 2 library design(s)
track design preview: Judge Roy Scream
Judge Roy Scream
track design preview: Titan
Titan
6 round(s)
chain lift inversion brake / booster round before height is the track's real elevation, walked from the piece list

Round 1

excitement5.62 intensity6.14 nausea3.66
length 489 m drops 3 airtime 28 tested ok similarity 0.28 (nearest: Flight of the Phoenix)

library: 1 search(es) studied Judge Roy Scream, Titan

brakesbrakesbrakes
64 pieces · 14 on the lift
track program (64 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "end_station",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    {
      "chain": true,
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_right_bank"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_bank_to_flat"
    },
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat_to_down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_right_bank",
    "right_helix_down_large",
    "right_helix_down_large",
    "right_bank_to_flat",
    "s_bend_left",
    "s_bend_right",
    "brakes",
    "brakes",
    "brakes",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat"
  ],
  "ride_type": 52,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 30
  }
}
park screenshot, claude-sonnet-5 round 1 view 1

Round 2

excitement5.91 intensity6.88 nausea3.99
length 557 m drops 4 airtime 41 tested ok similarity 0.29 (nearest: Bat Flight)

library: 1 search(es)

brakesbrakesbrakes
78 pieces · 18 on the lift · 14 added vs the round before (64 of 64 pieces kept)
track program (78 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "end_station",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    {
      "chain": true,
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_right_bank"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_bank_to_flat"
    },
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat_to_down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60",
    "down_60_to_down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_right_bank",
    "right_helix_down_large",
    "right_helix_down_large",
    "right_bank_to_flat",
    "s_bend_left",
    "s_bend_right",
    "brakes",
    "brakes",
    "brakes",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat"
  ],
  "ride_type": 52,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 30
  }
}
park screenshot, claude-sonnet-5 round 2 view 1

Round 3

excitement6.06 intensity7.07 nausea4.50
length 660 m drops 4 airtime 41 tested ok similarity 0.31 (nearest: Red Baron)

library: 1 search(es)

brakesbrakesbrakes
86 pieces · 22 on the lift · 8 added vs the round before (78 of 78 pieces kept)
track program (86 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "end_station",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    {
      "chain": true,
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_right_bank"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_bank_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_left_bank"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_bank_to_flat"
    },
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat_to_down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60",
    "down_60_to_down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_right_bank",
    "right_helix_down_large",
    "right_helix_down_large",
    "right_bank_to_flat",
    "flat_to_left_bank",
    "left_helix_down_small",
    "left_helix_down_small",
    "left_bank_to_flat",
    "s_bend_left",
    "s_bend_right",
    "brakes",
    "brakes",
    "brakes",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat"
  ],
  "ride_type": 52,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 30
  }
}
park screenshot, claude-sonnet-5 round 3 view 1

Round 4

excitement6.00 intensity7.23 nausea4.18
length 566 m drops 4 airtime 36 tested ok similarity 0.30 (nearest: Danglefeet)

library: 1 search(es)

brakesbrakesbrakes
80 pieces · 22 on the lift · 14 added, 20 removed vs the round before (66 of 86 pieces kept)
track program (80 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "end_station",
    {
      "chain": true,
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_right_bank"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_bank_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_left_bank"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_bank_to_flat"
    },
    "flat_to_left_bank",
    "banked_left_turn_3",
    "left_bank_to_flat",
    "flat_to_right_bank",
    "banked_right_turn_3",
    "right_bank_to_flat",
    "flat_to_right_bank",
    "banked_right_turn_3",
    "right_bank_to_flat",
    "flat_to_left_bank",
    "banked_left_turn_3",
    "left_bank_to_flat",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat_to_down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60",
    "down_60",
    "down_60_to_down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "s_bend_left",
    "s_bend_right",
    "brakes",
    "brakes",
    "brakes",
    "flat",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat"
  ],
  "ride_type": 52,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 30
  }
}
park screenshot, claude-sonnet-5 round 4 view 1

Round 5

excitement6.22 intensity7.88 nausea4.45
length 592 m drops 5 airtime 42 tested ok similarity 0.33 (nearest: Judge Roy Scream)

library: 1 search(es)

brakesbrakesbrakes
90 pieces · 26 on the lift · 23 added, 13 removed vs the round before (67 of 80 pieces kept)
track program (90 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "end_station",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    {
      "chain": true,
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_right_bank"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_bank_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_left_bank"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_bank_to_flat"
    },
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat_to_down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60",
    "down_60",
    "down_60",
    "down_60_to_down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "s_bend_left",
    "s_bend_right",
    "brakes",
    "brakes",
    "brakes",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat"
  ],
  "ride_type": 52,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 30
  }
}
park screenshot, claude-sonnet-5 round 5 view 1

Round 6

excitement6.30 intensity8.29 nausea4.62
length 607 m drops 5 airtime 40 tested ok similarity 0.35 (nearest: Judge Roy Scream)

library: 1 search(es)

brakesbrakesbrakes
92 pieces · 30 on the lift · 5 added, 3 removed vs the round before (87 of 90 pieces kept)
track program (92 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "middle_station",
    "end_station",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    {
      "chain": true,
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_right_bank"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_helix_up_large"
    },
    {
      "chain": true,
      "t": "right_bank_to_flat"
    },
    {
      "chain": true,
      "t": "flat_to_left_bank"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_helix_up_small"
    },
    {
      "chain": true,
      "t": "left_bank_to_flat"
    },
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat_to_down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60",
    "down_60",
    "down_60",
    "down_60",
    "down_60_to_down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "s_bend_left",
    "s_bend_right",
    "brakes",
    "brakes",
    "brakes",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "banked_left_turn_5",
    "left_bank_to_flat"
  ],
  "ride_type": 52,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 30
  }
}
park screenshot, claude-sonnet-5 round 6 view 1

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