STD-002 · Standards Compliance · difficulty 4/5

ISO 4762 M8×30 socket-head cap screw

sha256:7af0ce123b984091…

§1Prompt verbatim

Model an ISO 4762 M8 × 30 mm socket-head cap screw, property class 12.9, with a fully-formed thread (ISO 261 6g) and a hexagonal socket sized to take a 6 mm hex key. Head Ø 13, head height 8, fillet under-head R 0.4 mm.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.05 mm

featuresM8x1.25_thread, hex_socket_6mm, underhead_R0.4

§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)

n=4 senior engineers

0.7227✓

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

OpenAI + CadQuery 2.4

0.54312✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.53914✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4850✗

CAD-Coder R1

CAD-Coder Labs (research)

0.47212✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.4650✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.41311✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.40816✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.35014✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.24719✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.22525✗

DeepCAD

Wu et al. 2021 (research)

0.10745✗

no manifold solid produced

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

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.	GD&T Compliance	Standards Compliance	p50	latency	cost
Human Baseline (Mech-E)	✓	0.963	0.810	0.817	—	726.7s	$4.820
OpenAI o4 (reasoning) → CadQuery	✓	0.945	0.653	0.678	—	140.5s	$1.054
Adam (CADcrush)	✓	0.940	0.628	0.641	—	11.5s	$0.238
Claude Sonnet 4.6 → CadQuery	✓	0.938	0.564	0.655	—	17.9s	$0.061
Zoo Text-to-CAD	✓	0.932	0.642	0.752	—	5.3s	$0.196
GPT-5 → CadQuery	✓	0.939	0.612	0.724	—	32.1s	$0.191
DeepSeek R1 (reasoning) → CadQuery	✓	0.929	0.496	0.538	—	114.2s	$0.045
Claude Opus 4.7 → OpenSCAD	✓	0.928	0.423	0.590	—	25.1s	$0.276
CAD-Coder R1	✓	0.918	0.447	0.543	—	6.0s	$0.004
Gemini 2.5 Pro → OpenSCAD	✓	0.919	0.439	0.546	—	25.0s	$0.080
Qwen3 Coder → CadQuery	✓	0.914	0.391	0.470	—	18.8s	$0.032
Gemini 2.5 Flash → CadQuery	✓	0.914	0.493	0.568	—	14.6s	$0.024
Claude Haiku 4.5 → CadQuery	×	0.906	0.367	0.465	—	8.5s	$0.024
Llama 3.3 70B → OpenSCAD	×	0.888	0.286	0.387	—	17.8s	$0.023
GPT-5 Mini → OpenSCAD	×	0.883	0.274	0.379	—	10.5s	$0.009
DeepCAD	×	0.866	0.396	0.275	—	4.8s	$0.019
Claude Opus 4.7 → CadQuery kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	34.7s	$0.319
Trellis 3D	×	0.850	0.059	0.047	—	12.7s	$0.056
Spline AI	×	0.850	0.026	0.020	—	10.1s	$0.045
Hunyuan3D-2	×	0.850	0.059	0.046	—	29.8s	$0.084