DFMCNC-009 · DFM · 3-Axis CNC · difficulty 3/5

Long-aspect bracket (vise-fixturable)

sha256:01eba0fde2c01100…

§1Prompt verbatim

Mounting bracket 200 × 25 × 12 mm with three Ø 6.6 mm clearance holes on the back face and a 50 × 12 mm slot on the front. The part must be fixturable in a 6″ vise jaws (i.e. flat parallel sides ≥ 25 × 100 mm). 3-axis CNC machinable in two setups maximum.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.1 mm

featuresclearance_hole_x3, slot_50x12

§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)

n=4 senior engineers

0.8678✓

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.5380✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.53513✗

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.52914✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.51014✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.50110✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4660✗

CAD-Coder R1

CAD-Coder Labs (research)

0.43914✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.42214✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.41512✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

no manifold solid produced

DeepCAD

Wu et al. 2021 (research)

—74✗

no manifold solid produced

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

—50✗

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)	✓	0.979	93.8	0.838	0.829	1.000	—	933.0s	$5.973
OpenAI o4 (reasoning) → CadQuery	✓	0.948	86.6	0.706	0.683	0.000	—	127.6s	$1.289
Zoo Text-to-CAD	✓	0.940	82.8	0.636	0.779	0.000	—	8.0s	$0.209
Gemini 2.5 Pro → OpenSCAD	✓	0.927	72.2	0.524	0.442	0.000	—	25.8s	$0.092
Qwen3 Coder → CadQuery	✓	0.927	75.9	0.508	0.486	0.000	—	16.6s	$0.027
Claude Opus 4.7 → CadQuery	✓	0.928	82.8	0.605	0.726	0.000	—	47.5s	$0.362
Gemini 2.5 Flash → CadQuery	✓	0.923	76.9	0.542	0.523	0.000	—	8.7s	$0.023
GPT-5 → CadQuery	✓	0.929	81.9	0.582	0.653	0.000	—	40.3s	$0.212
Claude Sonnet 4.6 → CadQuery	✓	0.923	80.9	0.630	0.632	0.000	—	13.7s	$0.067
Adam (CADcrush)	✓	0.926	81.5	0.579	0.643	0.000	—	9.6s	$0.244
Claude Opus 4.7 → OpenSCAD	✓	0.923	79.4	0.546	0.537	0.000	—	38.1s	$0.288
CAD-Coder R1	✓	0.915	75.8	0.484	0.529	0.000	—	6.8s	$0.005
GPT-5 Mini → OpenSCAD	✓	0.919	72.5	0.476	0.387	0.000	—	17.3s	$0.009
DeepSeek R1 (reasoning) → CadQuery	×	0.912	75.2	0.530	0.553	0.000	—	78.7s	$0.043
Llama 3.3 70B → OpenSCAD	×	0.898	68.7	0.423	0.359	0.000	—	26.3s	$0.017
Trellis 3D	×	0.865	52.7	0.196	0.087	0.000	—	10.5s	$0.059
Hunyuan3D-2	×	0.859	52.8	0.231	0.096	0.000	—	31.0s	$0.067
Spline AI	×	0.858	48.7	0.103	0.046	0.000	—	7.3s	$0.039
DeepCAD kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	4.3s	$0.023
Claude Haiku 4.5 → CadQuery kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	7.8s	$0.021