Tube clamp

medium tier · create

The request

Make a one-piece tube clamp for a 20mm tube: a block with a 20.4mm horizontal bore through it, a 2mm slit from the top face down into the bore so it can pinch, and two 4mm vertical clamping-screw holes, one each side of the slit.

What the AI judge checks

Matches the request
Sane proportions, no junk features

This run used a free-text rubric: “A plausible pinch-style tube clamp: a horizontal bore for the tube, a visible slit from the top into the bore, and screw holes positioned to squeeze the slit closed. Penalize slits that don't reach the bore and screw holes that don't cross the slit.”

Measured checks

tube bore exists (some through-tunnel) (gate)
slit opened the top (bore not a closed tunnel alone)

Every model's attempts

GPT-5.6 Sol
100 100 95
100
$0.16
1m 22s
Sonnet 5
90 100 90
100
$0.31
3m 6s
Opus 4.8
95 85 100
100
$0.51
1m 5s
Gemini 3.8 Flash
100 95 100
100
$0.10
47s
GPT-5.6 Luna
100 91 95
100
$0.02
1m 5s
GLM 5.3 Flash (Z.ai)
err err err
—
—
5m 0s

This is an older run. See the current results.

Run stage2-hard-cases2026-09-04spend $17.43, 13 unpricedOther runs: 2026-09-10T19-44-23-baseline-2026-09, 2026-09-04T19-48-31-screen-14-fixed