PRIM-004 · Geometric Primitives · difficulty 1/5

Square-base pyramid frustum

sha256:8b701e2ddc40cf12…

§1Prompt verbatim

Solid frustum with 50 × 50 mm square base and 20 × 20 mm square top, height 30 mm, all four side faces plane. Origin at base centre. Output watertight solid.

§2Ground-truth spec

bbox50.0 × 50.0 × 30.0 mm

shells1

V−E+F2

genus0

watertighttrue

manifoldtrue

acceptance ε±0.03 mm

§3Reference render

canonical reference · drag to orbit, scroll to zoom

Visualisation is rebuilt in-browser from the canonical parametric description. Scoring is performed against the held-out reference STEP file (sha-256 fingerprint above).

§4Per-agent renders

reference + 10 agent outputs · scored against the held-out STEP

vol IoU · BREP · manifold

canonical reference

REFERENCE

canonical · ground truth

1.000100✓

Wu et al. 2021 (research)

0.8586✓

Human Baseline (Mech-E)

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.6778✓

CAD-Coder R1

CAD-Coder Labs (research)

0.67110✓

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.66511✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.6269✓

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.6230✗

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.61411✓

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.5900✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.58511✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.57411✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.56611✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.39914✗

no manifold solid produced

Spline AI

Spline.design

—2✗

Each tile is rebuilt from the canonical parametric description and degraded to match the agent's scored profile (tessellation, non-manifold face removal, dimension scale jitter, missing features). Image-only diffusion models render visually plausible meshes but score in the single digits on BREP fidelity — the geometry is not a manifold solid even when the render reads clean.

§5Per-agent metrics

ranked by Vol IoU · same data as the leaderboard, restricted to this task

Agent	Vol IoU	Bidirectional Chamfer	Watert.	Manif.	P@1	p50	latency	cost
Zoo Text-to-CAD	0.941	0.081	✓	0.990	1.000	—	7.7s	$0.201
DeepCAD	0.858	0.095	✓	0.973	0.000	—	5.5s	$0.023
Human Baseline (Mech-E)	0.813	0.131	✓	0.975	0.000	—	661.3s	$6.926
Adam (CADcrush)	0.805	0.136	✓	0.969	0.000	—	9.6s	$0.285
Qwen3 Coder → CadQuery	0.677	0.141	✓	0.955	0.000	—	12.8s	$0.026
CAD-Coder R1	0.671	0.108	✓	0.958	0.000	—	6.6s	$0.004
Claude Opus 4.7 → CadQuery	0.665	0.136	✓	0.948	0.000	—	42.9s	$0.392
Gemini 2.5 Flash → CadQuery	0.626	0.112	✓	0.953	0.000	—	12.7s	$0.018
Gemini 2.5 Pro → OpenSCAD	0.623	0.169	✓	0.939	0.000	—	29.5s	$0.091
OpenAI o4 (reasoning) → CadQuery	0.614	0.137	✓	0.950	0.000	—	108.7s	$0.958
Claude Opus 4.7 → OpenSCAD	0.590	0.142	✓	0.943	0.000	—	25.4s	$0.305
Claude Sonnet 4.6 → CadQuery	0.585	0.159	✓	0.939	0.000	—	14.5s	$0.062
GPT-5 → CadQuery	0.574	0.175	✓	0.938	0.000	—	34.1s	$0.172
DeepSeek R1 (reasoning) → CadQuery	0.566	0.153	✓	0.930	0.000	—	120.5s	$0.036
GPT-5 Mini → OpenSCAD	0.531	0.163	✓	0.934	0.000	—	15.6s	$0.009
Trellis 3D	0.528	0.188	✓	0.927	0.000	—	14.0s	$0.041
Claude Haiku 4.5 → CadQuery	0.478	0.164	✓	0.922	0.000	—	8.5s	$0.017
Hunyuan3D-2	0.417	0.214	×	0.910	0.000	—	30.6s	$0.080
Llama 3.3 70B → OpenSCAD	0.399	0.210	✓	0.913	0.000	—	18.4s	$0.021
Spline AI kernel error: BRepCheck_NotClosed	0.000	—	×	0.000	0.000	—	5.8s	$0.038