ASM-005 · Assembly & Mating · difficulty 3/5

Pin-in-hole, H7/g6 sliding fit

sha256:5cd0a7e3b4f10918…

§1Prompt verbatim

Cylindrical pin Ø 10 g6 × 40 mm long, chamfered 1×45° on both ends. Held-out partner has a Ø 10 H7 through-hole; the assembled clearance must lie in [0.005, 0.029] mm.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.005 mm

clearance[0.005, 0.029] 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)

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.61412✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.50711✗

CAD-Coder R1

CAD-Coder Labs (research)

0.46712✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.4510✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.44411✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.42912✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4200✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.38813✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.35014✗

DeepCAD

Wu et al. 2021 (research)

0.33718✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.32317✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.30117✗

no manifold solid produced

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

no manifold solid produced

Hunyuan3D-2

Tencent

—5✗

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	Watert.	Manif.	FeatRec	Mating Clearance	Fit-Class Compliance	P@1	p50	latency	cost
Human Baseline (Mech-E)	✓	0.968	0.827	0.820	0.838	1.000	—	672.1s	$5.607
Zoo Text-to-CAD	✓	0.940	0.713	0.771	0.573	0.000	—	7.2s	$0.166
DeepSeek R1 (reasoning) → CadQuery	✓	0.943	0.621	0.584	0.302	0.000	—	94.9s	$0.036
GPT-5 → CadQuery	✓	0.928	0.707	0.558	0.361	0.000	—	40.5s	$0.204
Adam (CADcrush)	✓	0.934	0.684	0.702	0.466	0.000	—	7.7s	$0.241
OpenAI o4 (reasoning) → CadQuery	✓	0.932	0.793	0.700	0.511	0.000	—	129.5s	$1.176
CAD-Coder R1	✓	0.919	0.670	0.511	0.262	0.000	—	4.8s	$0.005
Gemini 2.5 Pro → OpenSCAD	✓	0.917	0.511	0.422	0.207	0.000	—	26.3s	$0.087
Claude Sonnet 4.6 → CadQuery	✓	0.921	0.718	0.534	0.349	0.000	—	17.1s	$0.082
Qwen3 Coder → CadQuery	✓	0.915	0.590	0.520	0.213	0.000	—	12.7s	$0.027
Claude Opus 4.7 → OpenSCAD	✓	0.918	0.597	0.528	0.242	0.000	—	40.9s	$0.310
Gemini 2.5 Flash → CadQuery	×	0.911	0.595	0.462	0.274	0.000	—	14.9s	$0.018
Claude Haiku 4.5 → CadQuery	×	0.901	0.472	0.415	0.172	0.000	—	8.1s	$0.016
DeepCAD	×	0.903	0.464	0.363	0.163	0.000	—	5.4s	$0.017
GPT-5 Mini → OpenSCAD	×	0.897	0.392	0.333	0.104	0.000	—	11.7s	$0.012
Llama 3.3 70B → OpenSCAD	×	0.897	0.428	0.364	0.112	0.000	—	18.3s	$0.021
Claude Opus 4.7 → CadQuery kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	47.8s	$0.391
Trellis 3D	×	0.850	0.204	0.083	0.006	0.000	—	13.8s	$0.050
Spline AI	×	0.850	0.085	0.048	0.001	0.000	—	6.4s	$0.045
Hunyuan3D-2 kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	34.5s	$0.069