PRIM-001 · Geometric Primitives · difficulty 1/5

Hollow cylinder (60 × 40 × 100)

sha256:e3b0c44298fc1c14…

§1Prompt verbatim

Model a hollow cylinder with outer diameter 60 mm, inner diameter 40 mm, height 100 mm. Origin at the centroid of the bottom face. Output a watertight solid.

§2Ground-truth spec

volume157080.0 mm³

surface area34558.0 mm²

bbox60.0 × 60.0 × 100.0 mm

shells1

V−E+F0

genus1

watertighttrue

manifoldtrue

acceptance ε±0.05 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✓

Human Baseline (Mech-E)

CAD-Coder Labs (research)

0.77710✓

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.71812✓

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.7188✓

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.7139✓

DeepCAD

Wu et al. 2021 (research)

0.6937✓

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.6367✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.5930✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.58210✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.5750✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.57310✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.55613✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.53411✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

no manifold solid produced

Adam (CADcrush)

CADcrush

—79✗

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
Human Baseline (Mech-E)	0.864	0.128	✓	0.990	1.000	—	504.6s	$6.616
Zoo Text-to-CAD	0.834	0.127	✓	0.969	0.000	—	6.3s	$0.146
CAD-Coder R1	0.777	0.124	✓	0.963	0.000	—	4.8s	$0.005
Claude Opus 4.7 → CadQuery	0.718	0.110	✓	0.952	0.000	—	39.0s	$0.372
DeepSeek R1 (reasoning) → CadQuery	0.718	0.151	✓	0.957	0.000	—	105.4s	$0.040
OpenAI o4 (reasoning) → CadQuery	0.713	0.108	✓	0.955	0.000	—	133.4s	$1.291
DeepCAD	0.693	0.127	✓	0.959	0.000	—	5.5s	$0.019
GPT-5 → CadQuery	0.636	0.137	✓	0.947	0.000	—	34.2s	$0.233
Claude Sonnet 4.6 → CadQuery	0.619	0.145	✓	0.950	0.000	—	20.1s	$0.058
Trellis 3D	0.613	0.153	✓	0.937	0.000	—	9.4s	$0.043
Gemini 2.5 Pro → OpenSCAD	0.593	0.179	✓	0.935	0.000	—	36.2s	$0.083
GPT-5 Mini → OpenSCAD	0.582	0.144	✓	0.941	0.000	—	16.6s	$0.010
Claude Opus 4.7 → OpenSCAD	0.575	0.130	✓	0.945	0.000	—	22.9s	$0.319
Claude Haiku 4.5 → CadQuery	0.573	0.157	✓	0.941	0.000	—	6.7s	$0.019
Gemini 2.5 Flash → CadQuery	0.556	0.186	✓	0.930	0.000	—	13.7s	$0.018
Llama 3.3 70B → OpenSCAD	0.534	0.174	✓	0.926	0.000	—	21.3s	$0.016
Qwen3 Coder → CadQuery	0.508	0.138	✓	0.933	0.000	—	13.2s	$0.035
Hunyuan3D-2	0.473	0.160	✓	0.926	0.000	—	39.6s	$0.078
Spline AI	0.397	0.227	×	0.907	0.000	—	5.6s	$0.034
Adam (CADcrush) kernel error: BRepCheck_NotClosed	0.000	—	×	0.000	0.000	—	8.2s	$0.308