Knob then widen

Gemini 3.8 Flash$0.362m 50s2m 43s waiting on the model7 builds

Reference
iso
front
back
top
bottom
left
right

79of 100

built: 100
geometry: 72
AI judge: 4 of 6

What the AI judge checked

Pass:The overall form matches the reference: the same kind of object, the same silhouette from the matching angle, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
- Opus 4.8: pass: The render shows a knurled cylindrical knob with a chamfered edge and a top bore, matching the reference silhouette while being larger in diameter.
- GPT-5.6 Sol: pass: The result retains the same short cylindrical, chamfered, knurled puck form with a visibly wider diameter-to-height silhouette.
Pass:Proportions match: the relative sizes of the major dimensions agree with the reference within what the eye can judge, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
- Opus 4.8: pass: The disc remains short relative to its diameter with the knurl band on the side, consistent with the reference proportions after diameter enlargement.
- GPT-5.6 Sol: pass: The side render appears roughly 20% wider relative to its unchanged-looking height than the reference.
Pass:Every major feature visible in the reference (holes, slots, bosses, tabs, lips) is present in the result, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
- Opus 4.8: pass: Diamond knurling, chamfered edges, and the top bore are all present as in the reference.
- GPT-5.6 Sol: pass: The circumferential diamond knurl, top and bottom edge chamfers, flat faces, and central bore are all present.
Pass:Those features sit where the reference has them, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
- Opus 4.8: pass: The knurl wraps the outer wall, chamfers are on top and bottom edges, and the bore is centered on top as in the reference.
- GPT-5.6 Sol: pass: The knurl remains around the cylindrical sidewall, the chamfers remain at both rim edges, and the bore is centered on the top.
Fail:Nothing is present that the reference does not show — no decorative or unexplained geometry, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchangedAI judges disagreed
- Opus 4.8: pass: No extra decorative or unexplained geometry appears beyond the knurl, chamfer, and bore.
- GPT-5.6 Sol: fail: The rendered bore has an unexplained flat-sided D-shaped profile rather than a conventional circular opening.
Fail:The hole in the top is the same size as before — widened around it, not scaled with itAI judges disagreed
- Opus 4.8: pass: The central D-shaped bore appears relatively small compared to the enlarged top face, indicating the diameter grew around it rather than the bore scaling up.
- GPT-5.6 Sol: fail: The renders do not clearly establish the original bore size, and the visible bore profile appears altered into a D shape.

Measured

✓ watertight: ok
✓ one sub-part named knob: ok
✓ diameter grew by 20 %: ok
✓ height kept: ok
✗ the bore is unchanged: predicate returned false
✗ chamfered at the top rim: predicate returned false

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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