{
  "runDate": "2026-07-28",
  "runsPerBrief": 3,
  "harness": "scripts/model-selection-test.mjs",
  "metricsScript": "scripts/bench-repeatability.py",
  "commonLongEdgePx": 640,
  "crossModelComparisonIsIndicative": true,
  "briefs": [
    {
      "id": "ext-simple",
      "mode": "exterior",
      "aspect": "16:9",
      "label": "Exterior, open brief",
      "prompt": "A two-storey family house on a gentle slope, timber and white render, large windows facing the valley, late afternoon light."
    },
    {
      "id": "ext-constrained",
      "mode": "exterior",
      "aspect": "16:9",
      "label": "Exterior, eight constraints",
      "prompt": "A single-storey courtyard house in a dry mediterranean landscape. Flat roof with a deep overhang on the south side. Walls in warm lime render, window frames in dark bronze. One olive tree in the courtyard. Gravel ground, no lawn. Morning light from the left. No cars, no people. Photographed at eye level from the entrance side."
    },
    {
      "id": "int-simple",
      "mode": "interiors",
      "aspect": "3:2",
      "label": "Interior, open brief",
      "prompt": "A calm living room with a plaster fireplace, oak floor, linen sofa, and tall windows with sheer curtains."
    },
    {
      "id": "int-constrained",
      "mode": "interiors",
      "aspect": "3:2",
      "label": "Interior, material discipline",
      "prompt": "A kitchen in a converted stone barn. Exactly three materials: pale oak, honed black stone, and lime plaster. A single long island with no upper cabinets. One pendant light over the island. Original timber roof trusses visible. Overcast daylight from a window on the right. No decoration on the surfaces."
    },
    {
      "id": "plan-simple",
      "mode": "floor-plan",
      "aspect": "4:3",
      "label": "Floor plan, open brief",
      "prompt": "A clean architectural floor plan of a three-bedroom single-storey house, black lines on white, room labels, furniture indicated."
    },
    {
      "id": "plan-constrained",
      "mode": "floor-plan",
      "aspect": "4:3",
      "label": "Floor plan, programme given",
      "prompt": "An architectural floor plan, black line drawing on white. Programme: entrance hall, open kitchen and dining, separate living room, three bedrooms, one bathroom plus one WC, utility room, and a covered terrace on the south side. Single storey, roughly rectangular footprint. Label every room. Show wall thickness and door swings. No colour, no shading."
    },
    {
      "id": "master-simple",
      "mode": "masterplan",
      "aspect": "1:1",
      "label": "Masterplan, open brief",
      "prompt": "An aerial masterplan of a small residential cluster of eight houses around a shared green, with parking at the edge."
    },
    {
      "id": "master-constrained",
      "mode": "masterplan",
      "aspect": "1:1",
      "label": "Masterplan, site rules",
      "prompt": "An aerial site plan of a hillside development. Twelve dwellings in four terraced rows following the contours. One access road entering from the north-west, no through traffic. Communal parking in two pockets at the road edge. A pedestrian path linking all rows to a viewpoint at the south end. Existing trees kept along the eastern boundary. Top-down orthographic view."
    }
  ],
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    {
      "model": "Nuit F",
      "groups": 8,
      "variance": 45.8,
      "compositionIoU": 0.0726
    },
    {
      "model": "Nuit N",
      "groups": 8,
      "variance": 50.36,
      "compositionIoU": 0.0704
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    {
      "model": "Light",
      "groups": 8,
      "variance": 50.8,
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  ],
  "byMode": [
    {
      "mode": "floor-plan",
      "groups": 6,
      "variance": 34.77,
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      "mode": "exterior",
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      "variance": 52.73,
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      "mode": "masterplan",
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      "mode": "interiors",
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  ],
  "byBriefStyle": [
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      "style": "Open brief",
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      "compositionIoU": 0.0655
    },
    {
      "style": "Brief with constraints",
      "variance": 46.65,
      "compositionIoU": 0.0779
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  ],
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      "constrained": true,
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        "ext-constrained-light-r1",
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        "ext-constrained-light-r3"
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      "compositionIoU": 0.0692,
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          "a": "ext-constrained-light-r1",
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        {
          "a": "ext-constrained-light-r2",
          "b": "ext-constrained-light-r3",
          "variance": 49.16,
          "compositionIoU": 0.0723
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      ]
    },
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      "briefId": "ext-constrained",
      "briefLabel": "Exterior, eight constraints",
      "mode": "exterior",
      "constrained": true,
      "model": "Nuit F",
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      "frames": [
        "ext-constrained-f-r1",
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          "a": "ext-constrained-f-r1",
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          "a": "ext-constrained-f-r1",
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          "a": "ext-constrained-f-r2",
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      ]
    },
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      "briefId": "ext-constrained",
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      "model": "Nuit N",
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      ]
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        "ext-simple-light-r1",
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          "a": "ext-simple-light-r1",
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      ]
    },
    {
      "briefId": "ext-simple",
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      "model": "Nuit F",
      "runs": 3,
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        "ext-simple-f-r1",
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        "ext-simple-f-r3"
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      "compositionIoU": 0.0657,
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        {
          "a": "ext-simple-f-r1",
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        {
          "a": "ext-simple-f-r1",
          "b": "ext-simple-f-r3",
          "variance": 65.11,
          "compositionIoU": 0.0535
        },
        {
          "a": "ext-simple-f-r2",
          "b": "ext-simple-f-r3",
          "variance": 56.14,
          "compositionIoU": 0.0683
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      ]
    },
    {
      "briefId": "ext-simple",
      "briefLabel": "Exterior, open brief",
      "mode": "exterior",
      "constrained": false,
      "model": "Nuit N",
      "runs": 3,
      "frames": [
        "ext-simple-n-r1",
        "ext-simple-n-r2",
        "ext-simple-n-r3"
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      "variance": 51.12,
      "compositionIoU": 0.0731,
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        {
          "a": "ext-simple-n-r1",
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          "compositionIoU": 0.0698
        },
        {
          "a": "ext-simple-n-r1",
          "b": "ext-simple-n-r3",
          "variance": 49.74,
          "compositionIoU": 0.0709
        },
        {
          "a": "ext-simple-n-r2",
          "b": "ext-simple-n-r3",
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          "compositionIoU": 0.0788
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      ]
    },
    {
      "briefId": "int-constrained",
      "briefLabel": "Interior, material discipline",
      "mode": "interiors",
      "constrained": true,
      "model": "Light",
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        "int-constrained-light-r1",
        "int-constrained-light-r2",
        "int-constrained-light-r3"
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      "compositionIoU": 0.0864,
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        {
          "a": "int-constrained-light-r1",
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        {
          "a": "int-constrained-light-r1",
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          "variance": 49.77,
          "compositionIoU": 0.0723
        },
        {
          "a": "int-constrained-light-r2",
          "b": "int-constrained-light-r3",
          "variance": 56.17,
          "compositionIoU": 0.0902
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      ]
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      "briefId": "int-constrained",
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      ]
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      "briefId": "int-constrained",
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