SURF-002 · Free-form Surfaces · difficulty 5/5

Compressor blade (NACA 65-(12)10)

sha256:8de14b209c01ac72…

§1Prompt verbatim

Single compressor blade: 60 mm chord, 80 mm span, 12° twist root-to-tip, NACA-65-(12)10 thickness distribution along the camber line. G2 continuous suction and pressure surfaces, sharp trailing edge at 0.3 mm.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.05 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)

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.44415✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.38214✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.3300✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.28119✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.22720✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.22522✗

CAD-Coder R1

CAD-Coder Labs (research)

0.22126✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.2190✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.15530✗

DeepCAD

Wu et al. 2021 (research)

0.09251✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.08655✗

no manifold solid produced

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

—66✗

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.	p50	latency	cost
Human Baseline (Mech-E)	0.143	0.714	0.887	✓	0.951	—	721.2s	$6.144
Trellis 3D	0.172	0.741	0.854	✓	0.941	—	14.9s	$0.059
Hunyuan3D-2	0.133	0.795	0.859	✓	0.941	—	25.3s	$0.070
Zoo Text-to-CAD	0.173	0.854	0.806	✓	0.921	—	6.6s	$0.202
Claude Opus 4.7 → CadQuery	0.206	0.901	0.783	✓	0.913	—	40.8s	$0.363
Gemini 2.5 Flash → CadQuery	0.195	0.996	0.789	✓	0.915	—	15.1s	$0.020
Adam (CADcrush)	0.215	1.129	0.756	×	0.907	—	8.6s	$0.286
OpenAI o4 (reasoning) → CadQuery	0.211	1.070	0.759	×	0.904	—	131.1s	$1.172
GPT-5 Mini → OpenSCAD	0.250	1.091	0.752	×	0.904	—	17.5s	$0.010
Spline AI	0.202	1.033	0.765	×	0.907	—	7.8s	$0.038
Claude Opus 4.7 → OpenSCAD	0.278	1.355	0.750	×	0.898	—	39.8s	$0.326
Claude Haiku 4.5 → CadQuery	0.292	1.313	0.736	×	0.895	—	6.6s	$0.023
DeepSeek R1 (reasoning) → CadQuery	0.319	1.608	0.708	×	0.885	—	118.4s	$0.039
Claude Sonnet 4.6 → CadQuery	0.371	1.824	0.696	×	0.882	—	17.6s	$0.077
CAD-Coder R1	0.384	1.852	0.704	×	0.882	—	6.7s	$0.005
Gemini 2.5 Pro → OpenSCAD	0.357	1.699	0.697	×	0.884	—	29.2s	$0.108
Qwen3 Coder → CadQuery	0.465	2.376	0.673	×	0.875	—	16.9s	$0.025
DeepCAD	0.773	3.741	0.648	×	0.865	—	3.5s	$0.016
Llama 3.3 70B → OpenSCAD	0.863	4.334	0.650	×	0.863	—	18.0s	$0.018
GPT-5 → CadQuery kernel error: BRepCheck_NotClosed	—	—	—	×	0.000	—	44.2s	$0.213