← mecheval / run / a3-octagonal-flange-01 / openai-direct-gpt-5 / 20260428T232536Z-6b27

run 20260428T232536Z-6b27

a3-octagonal-flange-01 · openai-direct-gpt-5

Summary

statusfail
score0.83 (5/6)
submissionself-run
modelopenai-direct-gpt-5 (openai)
started2026-04-28T23:25:36.813Z
ended2026-04-28T23:26:50.142Z
tokens668 in · 5,857 out · 6,525 total
wallclock73.0s
tool calls1
task hash91605c57469285ce…
vcad hash5da95ac50e5efb0b…

Prompt

Make an octagonal prism flange. The outer cross-section is a regular octagon with flat-to-flat distance 40mm (apothem 20mm), oriented so two flats are parallel to the X axis (the top and bottom of the octagon). Height 8mm along Z, base on the XY plane (z = 0 to z = 8). Drill eight through-holes of diameter 5mm, axes parallel to Z, on a bolt circle of radius 15mm centered on the Z axis. The first bolt hole is on the +X axis, and the rest are evenly spaced every 45 degrees. Output a single solid.

Checks

0
valid_solid
pass
params + details 
params: {
  "type": "valid_solid"
}

details: {
  "root_count": 1,
  "solids_produced": 1
}
1
bbox
fail
X off by -1.65mm
params + details 
params: {
  "type": "bbox",
  "min": [
    -21.65,
    -20,
    0
  ],
  "max": [
    21.65,
    20,
    8
  ],
  "tolerance_mm": 0.3
}

details: {
  "actual_max": [
    20,
    20,
    8
  ],
  "actual_min": [
    -20,
    -20,
    0
  ],
  "deviation_max": [
    -1.6499999999999986,
    0,
    0
  ],
  "deviation_min": [
    1.6499999999999986,
    0,
    0
  ],
  "max_abs_deviation_mm": 1.6499999999999986,
  "tolerance_mm": 0.3
}
2
mass_props
pass
params + details 
params: {
  "type": "mass_props",
  "volume_mm3": 9347.81,
  "tolerance_pct": 1.5
}

details: {
  "volume": {
    "actual_mm3": 9355.289084146834,
    "deviation_pct": 0.08000894484199822,
    "pass": true,
    "spec_mm3": 9347.81,
    "tolerance_pct": 1.5
  }
}
3
hole_count
pass
params + details 
params: {
  "type": "hole_count",
  "diameter_mm": 5,
  "expected": 8,
  "diameter_tolerance_mm": 0.05
}

details: {
  "actual": 8,
  "diameter_mm": 5,
  "diameter_tolerance_mm": 0.05,
  "expected": 8,
  "found": [
    [
      15,
      0,
      5
    ],
    [
      10.6066,
      10.6066,
      5
    ],
    [
      0,
      15,
      5
    ],
    [
      -10.6066,
      10.6066,
      5
    ],
    [
      -15,
      0,
      5
    ],
    [
      -10.6066,
      -10.6066,
      5
    ],
    [
      0,
      -15,
      5
    ],
    [
      10.6066,
      -10.6066,
      5
    ]
  ]
}
4
hole_positions
pass
params + details 
params: {
  "type": "hole_positions",
  "diameter_mm": 5,
  "positions": [
    [
      15,
      0,
      0
    ],
    [
      10.61,
      10.61,
      0
    ],
    [
      0,
      15,
      0
    ],
    [
      -10.61,
      10.61,
      0
    ],
    [
      -15,
      0,
      0
    ],
    [
      -10.61,
      -10.61,
      0
    ],
    [
      0,
      -15,
      0
    ],
    [
      10.61,
      -10.61,
      0
    ]
  ],
  "tolerance_mm": 0.2
}

details: {
  "diameter_mm": 5,
  "per_expected": [
    {
      "distance_mm": 0,
      "matched_hole": [
        15,
        0
      ],
      "pass": true,
      "spec_xy": [
        15,
        0
      ]
    },
    {
      "distance_mm": 0.004808326112067366,
      "matched_hole": [
        10.6066,
        10.6066
      ],
      "pass": true,
      "spec_xy": [
        10.61,
        10.61
      ]
    },
    {
      "distance_mm": 0,
      "matched_hole": [
        0,
        15
      ],
      "pass": true,
      "spec_xy": [
        0,
        15
      ]
    },
    {
      "distance_mm": 0.004808326112067366,
      "matched_hole": [
        -10.6066,
        10.6066
      ],
      "pass": true,
      "spec_xy": [
        -10.61,
        10.61
      ]
    },
    {
      "distance_mm": 0,
      "matched_hole": [
        -15,
        0
      ],
      "pass": true,
      "spec_xy": [
        -15,
        0
      ]
    },
    {
      "distance_mm": 0.004808326112067366,
      "matched_hole": [
        -10.6066,
        -10.6066
      ],
      "pass": true,
      "spec_xy": [
        -10.61,
        -10.61
      ]
    },
    {
      "distance_mm": 0,
      "matched_hole": [
        0,
        -15
      ],
      "pass": true,
      "spec_xy": [
        0,
        -15
      ]
    },
    {
      "distance_mm": 0.004808326112067366,
      "matched_hole": [
        10.6066,
        -10.6066
      ],
      "pass": true,
      "spec_xy": [
        10.61,
        -10.61
      ]
    }
  ],
  "tolerance_mm": 0.2,
  "unmatched_extras": []
}
5
step_roundtrip
pass
params + details 
params: {
  "type": "step_roundtrip",
  "tolerance_pct": 1.5
}

details: {
  "per_solid": [
    {
      "bbox": {
        "max_abs_deviation_mm": 0,
        "original_max": [
          20,
          20,
          8
        ],
        "original_min": [
          -20,
          -20,
          0
        ],
        "pass": true,
        "roundtripped_max": [
          20,
          20,
          8
        ],
        "roundtripped_min": [
          -20,
          -20,
          0
        ],
        "tolerance_mm": 0.856971411425142
      },
      "index": 0,
      "pass": true,
      "volume": {
        "deviation_pct": 1.166606004700543e-13,
        "original_mm3": 9355.289084146834,
        "pass": true,
        "roundtripped_mm3": 9355.289084146845
      }
    }
  ],
  "tolerance_pct": 1.5
}

Tool calls

0
openai.chat.completions.create
ok
72952ms
args
{
  "model": "gpt-5",
  "max_tokens": 8000,
  "system_chars": 1674,
  "user_chars": 564
}

What the model built

isometric render via vcad-render · the model's actual .vcad output, faceted at 28 segments per cylinder · download 20260428T232536Z-6b27.vcad

.vcad source

{
  "version": "0.1",
  "nodes": {
    "1": { "id": 1, "name": "Square Prism A", "op": { "type": "Cube", "size": { "x": 40, "y": 40, "z": 8 } } },
    "2": { "id": 2, "name": "Centered Square Prism A", "op": { "type": "Translate", "child": 1, "offset": { "x": -20, "y": -20, "z": 0 } } },
    "3": { "id": 3, "name": "Square Prism B", "op": { "type": "Cube", "size": { "x": 40, "y": 40, "z": 8 } } },
    "4": { "id": 4, "name": "Centered Square Prism B", "op": { "type": "Translate", "child": 3, "offset": { "x": -20, "y": -20, "z": 0 } } },
    "5": { "id": 5, "name": "Rotated Square Prism B 45deg", "op": { "type": "Rotate", "child": 4, "angles": { "x": 0, "y": 0, "z": 45 } } },
    "6": { "id": 6, "name": "Octagonal Flange Body", "op": { "type": "Intersection", "left": 2, "right": 5 } },

    "7": { "id": 7, "name": "Hole Cylinder Base", "op": { "type": "Cylinder", "radius": 2.5, "height": 8, "segments": 32 } },
    "8": { "id": 8, "name": "Hole 0 deg (+X)", "op": { "type": "Translate", "child": 7, "offset": { "x": 15, "y": 0, "z": 0 } } },
    "9": { "id": 9, "name": "Hole 45 deg", "op": { "type": "Translate", "child": 7, "offset": { "x": 10.6066, "y": 10.6066, "z": 0 } } },
    "10": { "id": 10, "name": "Hole 90 deg (+Y)", "op": { "type": "Translate", "child": 7, "offset": { "x": 0, "y": 15, "z": 0 } } },
    "11": { "id": 11, "name": "Hole 135 deg", "op": { "type": "Translate", "child": 7, "offset": { "x": -10.6066, "y": 10.6066, "z": 0 } } },
    "12": { "id": 12, "name": "Hole 180 deg (-X)", "op": { "type": "Translate", "child": 7, "offset": { "x": -15, "y": 0, "z": 0 } } },
    "13": { "id": 13, "name": "Hole 225 deg", "op": { "type": "Translate", "child": 7, "offset": { "x": -10.6066, "y": -10.6066, "z": 0 } } },
    "14": { "id": 14, "name": "Hole 270 deg (-Y)", "op": { "type": "Translate", "child": 7, "offset": { "x": 0, "y": -15, "z": 0 } } },
    "15": { "id": 15, "name": "Hole 315 deg", "op": { "type": "Translate", "child": 7, "offset": { "x": 10.6066, "y": -10.6066, "z": 0 } } },

    "16": { "id": 16, "name": "Holes Union 1", "op": { "type": "Union", "left": 8, "right": 9 } },
    "17": { "id": 17, "name": "Holes Union 2", "op": { "type": "Union", "left": 16, "right": 10 } },
    "18": { "id": 18, "name": "Holes Union 3", "op": { "type": "Union", "left": 17, "right": 11 } },
    "19": { "id": 19, "name": "Holes Union 4", "op": { "type": "Union", "left": 18, "right": 12 } },
    "20": { "id": 20, "name": "Holes Union 5", "op": { "type": "Union", "left": 19, "right": 13 } },
    "21": { "id": 21, "name": "Holes Union 6", "op": { "type": "Union", "left": 20, "right": 14 } },
    "22": { "id": 22, "name": "Holes Union 7", "op": { "type": "Union", "left": 21, "right": 15 } },

    "23": { "id": 23, "name": "Flange with Holes", "op": { "type": "Difference", "left": 6, "right": 22 } }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
    { "root": 23, "material": "default" }
  ]
}
mecheval · an evaluation suite by Municipal Robotics
sibling project: vcad. · github

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