SKETCH-003 · 2-D Sketch Constraints · difficulty 2/5

Tangent-arc transition profile

sha256:12aa30c87ef00921…

§1Prompt verbatim

Closed profile: horizontal segment 50 mm, tangent-arc R 20 mm sweeping 90°, vertical segment 50 mm, tangent-arc R 20 mm sweeping 90° back to start. Apply tangent + equal-length + perpendicular constraints. Sketch must be fully constrained (DOF = 0).

§2Ground-truth spec

acceptance ε±0.001 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✓

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.8808✓

Human Baseline (Mech-E)

n=4 senior engineers

0.86110✓

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

OpenAI + CadQuery 2.4

0.71010✓

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.70111✓

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.65210✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.6350✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.60413✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.5770✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.53310✗

CAD-Coder R1

CAD-Coder Labs (research)

0.53113✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.42014✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.32718✗

DeepCAD

Wu et al. 2021 (research)

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	Bidirectional Chamfer	Watert.	Manif.	ConSolve	P@1	p50	latency	cost
OpenAI o4 (reasoning) → CadQuery	0.120	✓	0.976	0.869	1.000	—	113.9s	$1.230
Human Baseline (Mech-E)	0.129	✓	0.978	0.800	1.000	—	893.6s	$6.240
Claude Opus 4.7 → CadQuery	0.130	✓	0.962	0.836	0.000	—	26.8s	$0.377
Zoo Text-to-CAD	0.130	✓	0.951	0.740	0.000	—	7.2s	$0.182
GPT-5 → CadQuery	0.121	✓	0.965	0.791	0.000	—	29.0s	$0.251
Claude Sonnet 4.6 → CadQuery	0.119	✓	0.961	0.689	0.000	—	19.3s	$0.076
Qwen3 Coder → CadQuery	0.116	✓	0.948	0.690	0.000	—	17.0s	$0.030
Gemini 2.5 Pro → OpenSCAD	0.143	✓	0.941	0.538	0.000	—	23.5s	$0.080
DeepSeek R1 (reasoning) → CadQuery	0.165	✓	0.944	0.739	0.000	—	96.8s	$0.046
Adam (CADcrush)	0.136	✓	0.946	0.740	0.000	—	9.0s	$0.273
Gemini 2.5 Flash → CadQuery	0.153	✓	0.937	0.574	0.000	—	15.5s	$0.019
Claude Opus 4.7 → OpenSCAD	0.142	✓	0.943	0.569	0.000	—	38.2s	$0.341
Claude Haiku 4.5 → CadQuery	0.159	✓	0.926	0.506	0.000	—	6.4s	$0.018
CAD-Coder R1	0.143	✓	0.933	0.598	0.000	—	7.1s	$0.005
GPT-5 Mini → OpenSCAD	0.193	×	0.912	0.483	0.000	—	13.8s	$0.009
Llama 3.3 70B → OpenSCAD	0.245	×	0.901	0.409	0.000	—	18.0s	$0.018
DeepCAD	0.504	×	0.874	0.306	0.000	—	5.5s	$0.021
Trellis 3D	1.621	×	0.857	0.058	0.000	—	10.1s	$0.044
Spline AI	1.607	×	0.850	0.046	0.000	—	6.1s	$0.043
Hunyuan3D-2 kernel error: BRepCheck_NotClosed	—	×	0.000	—	0.000	—	32.5s	$0.067