Knob then widen

GPT-6 Sol, effort high$0.252m 10s2m 1s waiting on the model4 builds

Reference
iso
front
back
top
bottom
left
right

85of 100

built: 100
geometry: 84
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 5.5: pass: The result is a short knurled disc/knob with diamond knurling on its side and chamfered top and bottom edges, matching the reference's side silhouette.
- GPT-6 Sol: pass: The render shows the same low, cylindrical knurled form with chamfered edges as the reference.
Fail: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 unchangedAI judges disagreed
- Opus 5.5: pass: The side views show a wide, low disc whose width-to-height ratio is roughly 3.2–3.4, plausibly the reference's ~3:1 widened somewhat, though the full 20% increase is hard to confirm by eye.
- GPT-6 Sol: fail: In the side view, the rendered part appears noticeably taller relative to its diameter than the reference, despite the requested diameter increase.
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 5.5: pass: The diamond knurl band and the top and bottom chamfers seen in the reference are all present, and a bore is visible on top.
- GPT-6 Sol: pass: The visible chamfered edges and diamond-pattern side knurl are present in the render.
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 5.5: pass: The knurl spans the cylindrical side between the chamfered top and bottom edges, as in the reference.
- GPT-6 Sol: pass: The knurl remains on the cylindrical sidewall, between chamfered upper and lower edges as in the reference.
Pass: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 unchanged
- Opus 5.5: pass: Apart from the D-shaped bore on top, no extra decorative or unexplained geometry appears.
- GPT-6 Sol: pass: The renders show no extra bosses, tabs, or decorative features beyond the knurl and the bore specified in the request.
Fail:The hole in the top is the same size as before — widened around it, not scaled with it
- Opus 5.5: fail: The reference photo shows only the side, so the renders cannot confirm that the D-shaped top hole kept its original size rather than being scaled.
- GPT-6 Sol: fail: The reference side view does not show the bore, so the renders cannot establish that its size was preserved.

Measured

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

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Run hard-compact-2026-10-162026-10-16commit 6fa9f854spend $116.04 + $54.69 AI judging, 1 unpricedOther runs: 2026-11-05T06-56-21-kimi31-sonnet-hard, 2026-11-05T05-50-12-kimi31-vs-sonnet, 2026-09-23T06-56-16-hard-baseline-2026-09-23, 2026-09-10T19-44-23-baseline-2026-09, 2026-09-04T20-02-10-stage2-hard-cases, 2026-09-04T19-48-31-screen-14-fixed