BREP-007 · BREP Fidelity · difficulty 4/5

Trimmed sphere with hole through pole

sha256:a002cb1de4f01172…

§1Prompt verbatim

Sphere Ø 60 mm with a Ø 10 mm cylindrical hole through the +Z pole, depth 70 mm so it exits the −Z pole. The lateral face must remain a single trimmed spherical patch (not an arbitrary polysurface). Export AP242.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.02 mm

featurestrimmed_sphere, thru_hole_10

§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)

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.60310✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.59910✗

CAD-Coder R1

CAD-Coder Labs (research)

0.53310✗

DeepCAD

Wu et al. 2021 (research)

0.52612✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.51710✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.5179✗

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.47211✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.42312✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.40812✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.07767✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.0640✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.011104✗

no manifold solid produced

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

—66✗

no manifold solid produced

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

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.	Euler-Poincaré Compliance	STEP RT	FeatRec	P@1	p50	latency	cost
Human Baseline (Mech-E)	✓	0.972	✓	0.079	0.956	1.000	—	726.2s	$6.692
Zoo Text-to-CAD	✓	0.959	✓	0.074	0.751	0.000	—	5.9s	$0.203
Adam (CADcrush)	✓	0.939	✓	0.108	0.727	0.000	—	7.9s	$0.252
OpenAI o4 (reasoning) → CadQuery	✓	0.940	✓	0.096	0.729	0.000	—	79.2s	$1.133
DeepSeek R1 (reasoning) → CadQuery	✓	0.935	✓	0.096	0.671	0.000	—	80.4s	$0.045
CAD-Coder R1	✓	0.931	✓	0.097	0.687	0.000	—	7.3s	$0.006
DeepCAD	✓	0.926	×	0.116	0.496	0.000	—	5.3s	$0.024
Claude Sonnet 4.6 → CadQuery	✓	0.928	✓	0.102	0.652	0.000	—	21.8s	$0.084
Qwen3 Coder → CadQuery	✓	0.929	✓	0.090	0.596	0.000	—	18.8s	$0.033
Claude Opus 4.7 → CadQuery	✓	0.926	×	0.108	0.704	0.000	—	35.3s	$0.401
Claude Haiku 4.5 → CadQuery	✓	0.916	×	0.124	0.493	0.000	—	6.8s	$0.022
Gemini 2.5 Flash → CadQuery	✓	0.916	×	0.124	0.557	0.000	—	15.3s	$0.021
Llama 3.3 70B → OpenSCAD	×	0.861	×	0.672	0.399	0.000	—	16.6s	$0.021
Gemini 2.5 Pro → OpenSCAD	×	0.860	×	—	0.547	0.000	—	19.9s	$0.107
GPT-5 Mini → OpenSCAD	×	0.852	×	1.040	0.422	0.000	—	16.3s	$0.012
GPT-5 → CadQuery kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	44.7s	$0.187
Claude Opus 4.7 → OpenSCAD kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	29.5s	$0.263
Trellis 3D	×	0.850	×	—	0.191	0.000	—	8.7s	$0.050
Spline AI	×	0.850	×	—	0.092	0.000	—	8.9s	$0.040
Hunyuan3D-2	×	0.850	×	1.014	0.203	0.000	—	31.0s	$0.060