FUNC-007 · Functional Intent · FEA-Gated · difficulty 5/5

Heat-sink fin array for 25 W TO-220

sha256:a012b3e44c510fd0…

§1Prompt verbatim

Design a fin-array heat sink in 6063-T5 aluminium that holds a TO-220 device (mounting hole pattern given) below 95 °C junction at 25 W in still air at 25 °C ambient. Footprint ≤ 60 × 60 mm, height ≤ 35 mm. Output STEP.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.1 mm

featuresTO220_mount, fin_array

§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

0.6338✗

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.38814✗

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.38512✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.38117✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.35613✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.24823✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.2440✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.1960✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.17430✗

CAD-Coder R1

CAD-Coder Labs (research)

0.15232✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.12840✗

DeepCAD

Wu et al. 2021 (research)

0.06273✗

no manifold solid produced

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.000105✗

no manifold solid produced

Llama 3.3 70B → OpenSCAD

Meta + 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.	FeatRec	Min-Wall Compliance	FEA-Yield Pass	p50	latency	cost
Human Baseline (Mech-E)	✓	0.948	0.957	0.858	0.841	—	730.0s	$4.929
OpenAI o4 (reasoning) → CadQuery	✓	0.935	0.722	0.714	0.622	—	131.2s	$0.916
Zoo Text-to-CAD	✓	0.918	0.807	0.691	0.479	—	6.7s	$0.194
Claude Sonnet 4.6 → CadQuery	×	0.913	0.733	0.647	0.474	—	18.8s	$0.072
Claude Opus 4.7 → CadQuery	×	0.911	0.679	0.652	0.580	—	49.1s	$0.291
GPT-5 → CadQuery	×	0.905	0.706	0.659	0.475	—	30.7s	$0.200
DeepSeek R1 (reasoning) → CadQuery	×	0.906	0.671	0.589	0.545	—	119.6s	$0.040
Gemini 2.5 Flash → CadQuery	×	0.887	0.575	0.502	0.398	—	12.5s	$0.020
Claude Opus 4.7 → OpenSCAD	×	0.886	0.609	0.598	0.358	—	30.3s	$0.261
Gemini 2.5 Pro → OpenSCAD	×	0.879	0.492	0.537	0.385	—	34.2s	$0.076
Qwen3 Coder → CadQuery	×	0.875	0.625	0.498	0.394	—	18.9s	$0.025
CAD-Coder R1	×	0.875	0.672	0.517	0.295	—	6.1s	$0.004
Claude Haiku 4.5 → CadQuery	×	0.869	0.491	0.455	0.293	—	9.0s	$0.019
DeepCAD	×	0.860	0.486	0.359	0.198	—	4.0s	$0.017
Adam (CADcrush) kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	—	11.7s	$0.255
Trellis 3D	×	0.850	0.214	0.217	0.100	—	11.7s	$0.040
Spline AI	×	0.850	0.090	0.096	0.044	—	7.1s	$0.047
GPT-5 Mini → OpenSCAD	×	0.850	0.412	0.450	0.244	—	12.7s	$0.010
Llama 3.3 70B → OpenSCAD kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	—	26.5s	$0.023
Hunyuan3D-2	×	0.850	0.210	0.235	0.097	—	29.2s	$0.070