DFMCNC-013 · DFM · 3-Axis CNC · difficulty 4/5

5-axis-only fish-mouth saddle

sha256:a32ef0bcde011fa0…

§1Prompt verbatim

Bracket meant to wrap a Ø 60 mm pipe at 35° from vertical: a saddle cut profile that is the swept silhouette of a Ø 60 mm cylinder along the pipe axis, depth 25 mm. Geometry should be flagged as 'requires 5-axis indexing' by the analyzer (3-axis cannot reach the underside).

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.1 mm

featuresfish_mouth_saddle

§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 Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.62911✗

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.6248✓

CAD-Coder R1

CAD-Coder Labs (research)

0.61412✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.50510✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.47514✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.4660✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.46111✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.44815✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4050✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.35317✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.31817✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.28020✗

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	Watert.	Manif.	DFM	Min-Wall Compliance	CAM Reachability	P@1	p50	latency	cost
Human Baseline (Mech-E)	✓	0.963	91.4	0.831	0.818	1.000	—	665.4s	$6.016
Zoo Text-to-CAD	✓	0.956	84.8	0.691	0.766	0.000	—	5.5s	$0.153
Claude Sonnet 4.6 → CadQuery	✓	0.946	78.8	0.565	0.684	0.000	—	14.4s	$0.064
Claude Opus 4.7 → CadQuery	✓	0.951	82.8	0.606	0.669	0.000	—	44.0s	$0.378
CAD-Coder R1	✓	0.941	74.1	0.523	0.475	0.000	—	4.4s	$0.004
DeepSeek R1 (reasoning) → CadQuery	✓	0.946	75.6	0.588	0.555	0.000	—	83.8s	$0.045
Adam (CADcrush)	✓	0.928	77.7	0.661	0.638	0.000	—	11.9s	$0.283
OpenAI o4 (reasoning) → CadQuery	✓	0.929	85.3	0.714	0.727	0.000	—	122.7s	$0.899
GPT-5 → CadQuery	✓	0.923	80.3	0.630	0.595	0.000	—	48.9s	$0.207
Gemini 2.5 Pro → OpenSCAD	✓	0.919	73.3	0.542	0.505	0.000	—	30.6s	$0.079
Qwen3 Coder → CadQuery	✓	0.918	77.2	0.496	0.504	0.000	—	18.0s	$0.035
Gemini 2.5 Flash → CadQuery	✓	0.913	77.9	0.540	0.516	0.000	—	14.1s	$0.022
Claude Opus 4.7 → OpenSCAD	✓	0.914	77.5	0.571	0.497	0.000	—	37.1s	$0.330
Llama 3.3 70B → OpenSCAD	×	0.903	69.5	0.418	0.353	0.000	—	25.2s	$0.016
Claude Haiku 4.5 → CadQuery	×	0.898	71.0	0.464	0.387	0.000	—	7.5s	$0.020
GPT-5 Mini → OpenSCAD	×	0.896	70.5	0.449	0.346	0.000	—	14.3s	$0.011
DeepCAD	×	0.882	66.6	0.386	0.351	0.000	—	5.1s	$0.021
Trellis 3D	×	0.865	54.6	0.206	0.099	0.000	—	10.1s	$0.054
Spline AI	×	0.855	48.8	0.103	0.049	0.000	—	10.4s	$0.041
Hunyuan3D-2 kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	34.9s	$0.079