SURF-007 · Free-form Surfaces · difficulty 5/5

Mouse top-shell (Class-A)

sha256:1a2b03c0fde901ee…

§1Prompt verbatim

Computer-mouse top shell: 110 × 65 mm footprint, 38 mm peak height, two scroll-wheel cutouts 20 × 6 mm symmetric about the centerline 30 mm from the back. Class-A: G2 across the entire shell, max curvature deviation < 1 mm⁻¹.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.1 mm

featuresg2_class_a, scroll_cutout_x2

§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✓

Hunyuan3D-2

Tencent

0.74411✓

Human Baseline (Mech-E)

n=4 senior engineers

0.7448✓

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.49913✗

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4100✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.38712✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.35717✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.34719✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.2890✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.26818✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.24922✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.18028✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.16135✗

CAD-Coder R1

CAD-Coder Labs (research)

0.13632✗

DeepCAD

Wu et al. 2021 (research)

0.04699✗

no manifold solid produced

Spline AI

Spline.design

—2✗

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	Bidirectional Chamfer	Hausdorff p95	NormCons	Watert.	Manif.	P@1	p50	latency	cost
Hunyuan3D-2	0.133	0.574	0.903	✓	0.957	0.000	—	28.0s	$0.083
Human Baseline (Mech-E)	0.145	0.559	0.919	✓	0.966	1.000	—	753.3s	$6.621
Claude Opus 4.7 → CadQuery	0.184	0.754	0.823	✓	0.925	0.000	—	48.7s	$0.289
OpenAI o4 (reasoning) → CadQuery	0.151	0.839	0.819	✓	0.928	0.000	—	128.1s	$1.062
Trellis 3D	0.188	0.857	0.807	✓	0.924	0.000	—	8.7s	$0.056
Zoo Text-to-CAD	0.214	0.999	0.799	✓	0.918	0.000	—	4.7s	$0.179
Claude Opus 4.7 → OpenSCAD	0.198	0.961	0.779	×	0.909	0.000	—	40.5s	$0.249
GPT-5 → CadQuery	0.231	1.128	0.767	×	0.910	0.000	—	35.9s	$0.195
DeepSeek R1 (reasoning) → CadQuery	0.247	1.141	0.748	×	0.902	0.000	—	106.8s	$0.039
Gemini 2.5 Flash → CadQuery	0.263	1.251	0.752	×	0.901	0.000	—	13.0s	$0.017
Claude Sonnet 4.6 → CadQuery	0.242	1.161	0.735	×	0.898	0.000	—	20.9s	$0.061
Adam (CADcrush)	0.236	1.207	0.753	×	0.900	0.000	—	8.2s	$0.266
Gemini 2.5 Pro → OpenSCAD	0.238	1.200	0.746	×	0.897	0.000	—	23.2s	$0.101
Llama 3.3 70B → OpenSCAD	0.325	1.457	0.710	×	0.889	0.000	—	15.8s	$0.018
Qwen3 Coder → CadQuery	0.321	1.395	0.729	×	0.891	0.000	—	14.3s	$0.031
Claude Haiku 4.5 → CadQuery	0.458	2.266	0.691	×	0.877	0.000	—	7.4s	$0.020
GPT-5 Mini → OpenSCAD	0.511	2.631	0.676	×	0.873	0.000	—	14.4s	$0.011
CAD-Coder R1	0.528	2.548	0.674	×	0.872	0.000	—	7.4s	$0.005
DeepCAD	1.547	7.812	0.623	×	0.857	0.000	—	5.8s	$0.019
Spline AI kernel error: BRepCheck_NotClosed	—	—	—	×	0.000	0.000	—	9.1s	$0.033