GPT-5 Mini → OpenSCAD
B · Engineering-Aidedcomposite 48.0 [44.7, 51.7]p5 29.5IRT θ 1.9
OpenAI + OpenSCAD 2024.06· vgpt-5-mini + openscad 2024.06· released 2026-01-30· LLM+OpenSCAD· emits OpenSCAD· proprietary· 256k ctx· $0.0006/$0.0024 per 1k tok
Targets the hobbyist envelope: cheap, mesh-only, OpenSCAD CSG. Surprisingly competent on primitives; collapses on standards-compliance and reverse-engineering.
solid: agent · dashed: human baseline
PER-CATEGORY SCORE (95 % CI)
Geometric Primitives
79.6
Boolean Robustness
64.6
BREP Fidelity
41.7
Free-form Surfaces
77.8
Parametric Mechanical Parts
46.4
Assembly & Mating
29.2
Standards Compliance
32.9
Sheet-Metal Bodies
48.9
Sealing-Groove Design
53.4
Kinematic Mechanisms
40.2
DFM · 3-Axis CNC
50.7
DFM · Injection Mould
39.9
DFM · FDM 3D Print
66.9
CAM Toolpath Validity
39.1
Constraint Solving & Editability
44.2
Reverse Engineering
45.5
2-D Sketch Constraints
68.5
Functional Intent · FEA-Gated
36.7
Paraphrase Robustness
72.5
Confidence Calibration
31.9
MEAN METRICS BY LAYER
L1 · Geometry
| Category | Vol IoU | Chamfer | Hausdorff | NormCons | Watert. | Manif. | Euler | STEP RT | P@1 |
|---|---|---|---|---|---|---|---|---|---|
| Geometric Primitives | 0.492 | 0.182 | — | — | — | 0.924 | — | — | — |
| Boolean Robustness | 0.464 | — | — | — | — | 0.921 | — | — | — |
| BREP Fidelity | — | — | — | — | — | 0.855 | — | 0.879 | — |
| Free-form Surfaces | — | 0.350 | 1.715 | 0.716 | — | — | — | — | — |
L2 · Engineering
| Category | Dim RMSE | GD&T | FeatRec | Mating | Fit-Cls | Std |
|---|---|---|---|---|---|---|
| Parametric Mechanical Parts | 0.320 | 0.284 | 0.426 | — | — | — |
| Assembly & Mating | — | — | 0.403 | 0.362 | 0.112 | — |
| Standards Compliance | — | 0.282 | — | — | — | 0.376 |
| Sheet-Metal Bodies | 0.343 | — | 0.406 | — | — | — |
| Sealing-Groove Design | 0.291 | — | — | — | — | 0.360 |
| Kinematic Mechanisms | — | — | 0.408 | 0.341 | — | — |
L3 · Manufacturing
| Category | DFM | Draft | Min-Wall | CAM-Reach | Supp | Wall-Unif |
|---|---|---|---|---|---|---|
| DFM · 3-Axis CNC | 71.675 | — | 0.443 | 0.360 | — | — |
| DFM · Injection Mould | — | 0.362 | 0.423 | — | — | 0.411 |
| DFM · FDM 3D Print | 74.933 | — | 0.455 | — | 0.394 | — |
| CAM Toolpath Validity | — | — | — | 0.385 | — | — |
L4 · Cognition
| Category | ParamEdit | ConSolve | P-Range | FEA-σ | Para σ | Seed σ | Brier | EditLat |
|---|---|---|---|---|---|---|---|---|
| Constraint Solving & Editability | 0.463 | 0.454 | 0.408 | — | — | — | — | — |
| Reverse Engineering | — | — | — | — | — | — | — | — |
| 2-D Sketch Constraints | — | 0.458 | — | — | — | — | — | — |
| Functional Intent · FEA-Gated | — | — | — | 0.236 | — | — | — | — |
| Paraphrase Robustness | — | — | — | — | 0.038 | 0.073 | — | — |
| Confidence Calibration | — | — | — | — | — | — | 0.180 | — |
TASK-BY-TASK ARTIFACTS
PRIM-001Hollow cylinder (60 × 40 × 100)0.5820.00PRIM-007Right hexagonal prism with pitch fillet0.5060.00BOOL-003Coplanar-face union (knife-edge stress)0.4310.00BOOL-009High-genus subtraction (lattice block)0.5810.00BREP-004NURBS-handle goblet (G2 swept loft)0.1090.00SURF-002Compressor blade (NACA 65-(12)10)0.3670.00MECH-014L-bracket with M6 + slotted hole0.3910.00MECH-022Stepped shaft with retaining-ring groove0.2740.00MECH-027Planetary-gear carrier plate0.3800.00ASM-005Pin-in-hole, H7/g6 sliding fit0.3230.00ASM-011Dovetail slide (60° flanks)0.3500.00STD-002ISO 4762 M8×30 socket-head cap screw0.2250.00SHEET-003U-channel bracket, 1.5 mm Al, k=0.400.3110.00SEAL-001AS568-214 face-seal groove0.2860.00KIN-002Four-bar linkage, Grashof crank-rocker0.1820.00DFMCNC-0023-ax-machinable manifold block0.2780.00DFMMOLD-002Injection-mouldable enclosure half0.3480.00DFMFDM-008FDM-printable hinge (no support)0.4190.00CAM-0015-pocket plate, Ø3 endmill finish0.3510.00PARAM-006Editable flange (bolt circle param sweep)0.4320.00PARAM-013Editable bracket (length+30 %, hole→M8)0.3260.00REVENG-002Three-view ortho → bracket0.3430.00REVENG-009Three-view ortho → housing with cores0.2740.00SKETCH-003Tangent-arc transition profile0.4200.00FUNC-001Cantilever bracket — 250 N tip load, 6061-T6, SF≥40.2010.00FUNC-007Heat-sink fin array for 25 W TO-2200.0000.00PARA-0015× paraphrased L-bracket0.4600.00CAL-003Confidence-calibrated planetary carrier0.3020.00PRIM-002Sphere with planar cap0.5200.00PRIM-003Right truncated cone (frustum)0.4640.00PRIM-004Square-base pyramid frustum0.5310.00PRIM-005Tilted-axis box (30°)0.4320.00PRIM-009Hollow torus (Ø100 mean × Ø8 tube, 1 mm wall)0.4060.00BOOL-001Tangent cylinder onto cube (line-of-contact)0.3690.00BOOL-002Two interpenetrating spheres (lens intersection)0.5240.00BOOL-005ε-offset extrusion (sliver-face stress)0.4150.00BREP-001Periodic-spline cylinder (closed in U)0.0040.00BREP-002G1-only loft (tangent discontinuity)0.0000.00BREP-007Trimmed sphere with hole through pole0.0110.00SURF-001Ergonomic mug handle (revolved spline)0.2980.00SURF-007Mouse top-shell (Class-A)0.1610.00MECH-002Bearing block — two 6204 deep-groove bearings0.3110.00MECH-005Cam-follower lever (eccentric pivot)0.2270.00MECH-018Heat-set insert boss array (4× M3)0.3520.00MECH-031Threaded cap with diamond knurl0.2680.00ASM-001Threaded coupling M16×1.5 (male+female pair)0.3110.00ASM-008Spline shaft + hub (DIN 5480 W25×1.25×18)0.2620.00ASM-013Bayonet quarter-turn mount0.3510.00STD-001ISO 7050 self-tapping screw ST4.2 × 160.2250.00STD-005ISO 8734 dowel pin Ø6 m6 × 300.2000.00STD-008ASME B18.6.3 button-head 1/4-20 × 5/80.3230.00SHEET-001Box-pan with corner relief cuts0.2610.00SHEET-0073-bend electronics chassis0.4160.00SEAL-004AS568-218 piston-type radial groove0.2720.00SEAL-007ISO 3601-2 quad-ring face groove0.2250.00KIN-005Geneva drive — 4 station0.2410.00KIN-008Planetary gearset full mesh (sun + 3 planets + ring)0.1600.00DFMCNC-0054-pocket plate, R 0.5 internal corners0.3420.00DFMCNC-009Long-aspect bracket (vise-fixturable)0.4220.00DFMCNC-0135-axis-only fish-mouth saddle0.2800.00DFMMOLD-005Telephone handset shell0.1120.00DFMFDM-002Bridge-test calibration cube0.4170.00DFMFDM-011Print-in-place hinge0.4420.00CAM-005T-slot pocket array (Ø 8 + Ø 4 endmills)0.2720.00PARAM-009Configurable bottle (height + cap params)0.3330.00REVENG-005ABC dataset stepped pulley (multi-view)0.2100.00SKETCH-014Symmetric four-bar profile0.5060.00FUNC-003Heat-sink for 60 W CoB LED0.0170.00PARA-0055× paraphrased planetary carrier0.4870.00CAL-007Confidence-bracketed mounting flange0.2890.00