PRIM-005 · Geometric Primitives · difficulty 2/5

Tilted-axis box (30°)

sha256:4a01b1cce2010f99…

§1Prompt verbatim

Box 40 × 40 × 80 mm whose long axis is rotated 30° about Y from +Z. Origin at the centroid. Solid, watertight.

§2Ground-truth spec

shells1

V−E+F2

genus0

watertighttrue

manifoldtrue

acceptance ε±0.05 mm

Probes whether the agent honours the rotation axis or normalises the prompt to bbox-aligned.

§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✓

CAD-Coder Labs (research)

0.7957✓

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.7467✓

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.7368✓

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

OpenAI + CadQuery 2.4

0.6318✗

Human Baseline (Mech-E)

n=4 senior engineers

0.62910✗

DeepCAD

Wu et al. 2021 (research)

0.59110✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.56813✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.5480✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.53211✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.5310✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.43211✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

no manifold solid produced

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

—50✗

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.	p50	latency	cost
Zoo Text-to-CAD	0.802	0.119	✓	0.964	—	5.4s	$0.165
CAD-Coder R1	0.795	0.101	✓	0.964	—	6.7s	$0.005
Claude Sonnet 4.6 → CadQuery	0.746	0.155	✓	0.955	—	23.0s	$0.059
Claude Opus 4.7 → CadQuery	0.736	0.129	✓	0.954	—	46.1s	$0.395
OpenAI o4 (reasoning) → CadQuery	0.706	0.153	✓	0.953	—	110.5s	$1.049
Adam (CADcrush)	0.687	0.122	✓	0.948	—	11.1s	$0.253
GPT-5 → CadQuery	0.631	0.166	✓	0.943	—	36.4s	$0.189
Human Baseline (Mech-E)	0.629	0.145	✓	0.948	—	846.2s	$5.511
DeepCAD	0.591	0.149	✓	0.939	—	4.9s	$0.017
Gemini 2.5 Flash → CadQuery	0.568	0.144	✓	0.934	—	11.8s	$0.019
Claude Opus 4.7 → OpenSCAD	0.548	0.167	✓	0.934	—	31.5s	$0.318
Qwen3 Coder → CadQuery	0.532	0.187	✓	0.925	—	19.1s	$0.025
Gemini 2.5 Pro → OpenSCAD	0.531	0.166	✓	0.925	—	20.4s	$0.086
DeepSeek R1 (reasoning) → CadQuery	0.531	0.149	✓	0.928	—	72.0s	$0.034
Spline AI	0.490	0.193	✓	0.919	—	8.5s	$0.046
Hunyuan3D-2	0.434	0.179	✓	0.915	—	34.8s	$0.066
GPT-5 Mini → OpenSCAD	0.432	0.170	✓	0.918	—	17.3s	$0.010
Llama 3.3 70B → OpenSCAD	0.404	0.197	×	0.910	—	24.4s	$0.018
Trellis 3D	0.364	0.196	×	0.909	—	13.2s	$0.044
Claude Haiku 4.5 → CadQuery kernel error: BRepCheck_NotClosed	0.000	—	×	0.000	—	9.5s	$0.021