STD-008 · Standards Compliance · difficulty 4/5

ASME B18.6.3 button-head 1/4-20 × 5/8

sha256:13af0bd9c20efa11…

§1Prompt verbatim

Button-head cap screw per ASME B18.6.3: 1/4-20 UNC × 5/8″ long, head Ø 0.437″, head height 0.142″, hex socket 5/32″ across-flats. Property class 18-8 stainless. Output dimensions in mm internally.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.1 mm

featuresunc_1/4-20_thread, hex_socket_5/32

§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)

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

CAD-Coder Labs (research)

0.58913✗

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.53412✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.5280✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.51911✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.49912✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.46015✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4430✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.43514✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.32315✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.31518✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.31419✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.29316✗

DeepCAD

Wu et al. 2021 (research)

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)	✓	0.967	0.903	0.895	—	888.5s	$6.821
Adam (CADcrush)	✓	0.946	0.667	0.663	—	11.7s	$0.277
Claude Opus 4.7 → CadQuery	✓	0.943	0.626	0.776	—	39.6s	$0.311
Zoo Text-to-CAD	✓	0.949	0.703	0.727	—	6.0s	$0.154
CAD-Coder R1	✓	0.934	0.418	0.475	—	4.5s	$0.004
OpenAI o4 (reasoning) → CadQuery	✓	0.930	0.604	0.769	—	121.7s	$0.897
Gemini 2.5 Pro → OpenSCAD	✓	0.936	0.427	0.520	—	36.1s	$0.073
Claude Sonnet 4.6 → CadQuery	✓	0.925	0.618	0.666	—	22.3s	$0.073
GPT-5 → CadQuery	✓	0.924	0.558	0.678	—	36.6s	$0.178
Gemini 2.5 Flash → CadQuery	✓	0.917	0.453	0.513	—	9.6s	$0.018
Claude Opus 4.7 → OpenSCAD	✓	0.917	0.467	0.587	—	30.4s	$0.327
Qwen3 Coder → CadQuery	✓	0.918	0.412	0.480	—	14.3s	$0.033
GPT-5 Mini → OpenSCAD	×	0.900	0.294	0.365	—	12.1s	$0.010
Claude Haiku 4.5 → CadQuery	×	0.897	0.397	0.466	—	10.1s	$0.019
DeepSeek R1 (reasoning) → CadQuery	×	0.899	0.543	0.547	—	111.8s	$0.047
Llama 3.3 70B → OpenSCAD	×	0.894	0.299	0.390	—	25.7s	$0.021
DeepCAD	×	0.886	0.343	0.263	—	4.1s	$0.023
Trellis 3D	×	0.850	0.059	0.047	—	9.4s	$0.051
Spline AI	×	0.850	0.027	0.018	—	5.8s	$0.033
Hunyuan3D-2	×	0.850	0.053	0.046	—	36.4s	$0.083