SEAL-004 · Sealing-Groove Design · difficulty 4/5

AS568-218 piston-type radial groove

sha256:ae0bf01dc20a91ee…

§1Prompt verbatim

Piston-side radial groove for an AS568-218 O-ring (Ø 1.484 in × 0.139 in cross-section). Sealed pressure 21 MPa hydraulic, dynamic. Apply 12-17 % squeeze, 60-85 % groove fill. Output the piston with the groove cut into its OD.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.05 mm

featuresgroove_AS568-218_piston

§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

0.5939✗

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.5908✗

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.56010✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.54010✗

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.49913✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.45210✗

CAD-Coder R1

CAD-Coder Labs (research)

0.43813✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.4100✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.39315✗

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.35516✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.3330✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

0.27219✗

DeepCAD

Wu et al. 2021 (research)

0.023102✗

no manifold solid produced

no manifold solid produced

Spline AI

Spline.design

—2✗

no manifold solid produced

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

—50✗

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.	Named-Dimension RMSE	Standards Compliance	P@1	p50	latency	cost
Human Baseline (Mech-E)	✓	0.973	0.067	0.849	1.000	—	667.6s	$6.361
Zoo Text-to-CAD	✓	0.954	0.175	0.704	0.000	—	5.7s	$0.167
Claude Sonnet 4.6 → CadQuery	✓	0.947	0.219	0.628	0.000	—	16.0s	$0.059
OpenAI o4 (reasoning) → CadQuery	✓	0.946	0.241	0.678	0.000	—	81.1s	$1.166
GPT-5 → CadQuery	✓	0.939	0.203	0.653	0.000	—	35.4s	$0.249
DeepSeek R1 (reasoning) → CadQuery	✓	0.928	0.277	0.610	0.000	—	79.4s	$0.041
Claude Opus 4.7 → CadQuery	✓	0.929	0.263	0.664	0.000	—	34.7s	$0.284
Gemini 2.5 Flash → CadQuery	✓	0.923	0.280	0.589	0.000	—	14.3s	$0.024
CAD-Coder R1	×	0.912	0.319	0.525	0.000	—	6.4s	$0.006
Claude Opus 4.7 → OpenSCAD	×	0.909	0.247	0.558	0.000	—	37.6s	$0.341
Qwen3 Coder → CadQuery	×	0.911	0.317	0.514	0.000	—	17.4s	$0.025
Llama 3.3 70B → OpenSCAD	×	0.901	0.315	0.392	0.000	—	24.4s	$0.024
Gemini 2.5 Pro → OpenSCAD	×	0.900	0.314	0.505	0.000	—	28.3s	$0.074
GPT-5 Mini → OpenSCAD	×	0.889	0.290	0.344	0.000	—	13.6s	$0.009
DeepCAD	×	0.854	0.349	0.270	0.000	—	5.5s	$0.018
Adam (CADcrush) kernel error: BRepCheck_NotClosed	×	0.000	—	—	0.000	—	10.8s	$0.231
Trellis 3D	×	0.850	0.492	0.049	0.000	—	13.4s	$0.059
Spline AI kernel error: BRepCheck_NotClosed	×	0.000	—	—	0.000	—	10.0s	$0.042
Claude Haiku 4.5 → CadQuery kernel error: BRepCheck_NotClosed	×	0.000	—	—	0.000	—	8.6s	$0.018
Hunyuan3D-2 kernel error: BRepCheck_NotClosed	×	0.000	—	—	0.000	—	29.3s	$0.068