Photo knob

Gemini 3.8 Flash$0.333m 17s3m 13s waiting on the model8 builds, 1 failed

Reference
iso
front
back
top
bottom
left
right

84of 100

built: 85
geometry: 77
AI judge: 7 of 7

What the AI judge checked

Pass:The overall form matches the reference: the same kind of object, the same silhouette from the matching angle
- Opus 4.8: pass: The render shows a short cylindrical knurled knob matching the reference silhouette from the side.
- GPT-5.6 Sol: pass: The renders show the same low cylindrical knurled-knob silhouette with chamfered upper and lower rims as the reference.
Pass:Proportions match: the relative sizes of the major dimensions agree with the reference within what the eye can judge
- Opus 4.8: pass: The wide-to-short disc proportions closely match the reference's flat knurled cylinder.
- GPT-5.6 Sol: pass: The rendered knob’s width-to-height ratio and narrow rim bands visually agree with the reference.
Pass:Every major feature visible in the reference (holes, slots, bosses, tabs, lips) is present in the result
- Opus 4.8: pass: Knurl, both chamfered rims, and the top bore are all present as in the reference.
- GPT-5.6 Sol: pass: The visible diamond-patterned side grip and chamfered rim features from the reference are present.
Pass:Those features sit where the reference has them
- Opus 4.8: pass: Knurl wraps the side, chamfers at both rims, and the bore is centered in the top face as expected.
- GPT-5.6 Sol: pass: The knurl occupies the cylindrical side between smooth chamfered rim bands in the same arrangement as the reference.
Pass:Nothing is present that the reference does not show — no decorative or unexplained geometry
- Opus 4.8: pass: No extra unexplained geometry beyond the knurl, chamfers, and the bore.
- GPT-5.6 Sol: pass: No unexplained bosses, tabs, slots, or decorative features beyond the requested knurl, chamfers, and bore are visible.
Pass:A diamond knurl around the side — crossing grooves, not smooth and not straight ridges
- Opus 4.8: pass: The side shows crossing diagonal grooves forming a diamond pattern, not straight ridges.
- GPT-5.6 Sol: pass: The side clearly has intersecting diagonal ridges forming a continuous diamond knurl rather than a smooth surface or straight ridges.
Pass:A flat top face with a single hole in its centre and nothing else cut into it
- Opus 4.8: pass: The flat top has a single central bore with a flat on one side and nothing else cut into it.
- GPT-5.6 Sol: pass: The top view shows one centered D-flat bore in an otherwise uncut flat top face.

One reviewer

Verdict: acceptable (from the ranking's acceptable line, not typed on this attempt)

Measured

✓ watertight: ok
✓ one sub-part named knob: ok
✓ diameter is 38.13 mm: ok
✓ height is 12 mm ± 10 %: ok
✓ the bore clears 9.5 mm to 10.64 mm deep: ok
✓ the bore is not oversize: ok
✗ the D flat is where the prompt put it: predicate returned false
✓ the flat is not cut too deep: ok
✓ the bore is blind: ok
✗ chamfered at the top rim: predicate returned false
✗ chamfered at the bottom rim: predicate returned false
✓ the side is full at mid-height: ok
✓ the top face is flat out to 34.7 mm: ok

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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