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Spacer evolution

easy tier · iterate

The requests, in order

1Make an M4 spacer: 9mm outer diameter, 4.5mm bore, 10mm tall.
2Double its height to 20mm.
3Give it a hexagonal outside instead of round — 10mm across flats — keeping the same bore and height.

What the AI judge checks

    Measured checks

    • height is 20
    • across-flats ~10
    • height still 20

    Ranked by hand

    One reviewer put one attempt from each model in order, best first, ties left tied.

    1. #1 tie
      Gemini 3.8 Flash
      Gemini 3.8 Flash's ranked attempt
    2. #1 tie
      GPT-5.6 Sol
      GPT-5.6 Sol's ranked attempt
    3. #1 tie
      GPT-6 Astra
      GPT-6 Astra's ranked attempt
    4. #1 tie
      Opus 5
      Opus 5's ranked attempt
    5. #1 tie
      Fable 5.1
      Fable 5.1's ranked attempt

    Ordering by hand decides Human rank and Human rate on the leaderboard; it never affects Overall or Strict.

    Every model's attempts

    Run baseline-2026-092026-09-10commit 41aec7daspend $339.70 + $48.02 AI judging, 7 unpricedOther runs: 2026-09-04T20-02-10-stage2-hard-cases, 2026-09-04T19-48-31-screen-14-fixed