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KIN-008 · Kinematic Mechanisms · difficulty 5/5

Planetary gearset full mesh (sun + 3 planets + ring)

sha256:44ec01ef0bc20e11

§1Prompt verbatim

Planetary gear stack: module 1.5, sun 21T, planets 21T (×3), ring 63T, all 20° pressure angle, face width 8 mm, ISO 53 profile. Carrier plate Ø 110 × 4 mm. The full stack must mesh — no tooth interference, planet teeth align with sun and ring simultaneously. Output assembly STEP.

§2Ground-truth spec

shells5
watertighttrue
manifoldtrue
acceptance ε±0.02 mm
featuressun_21T, planet_21T_x3, ring_63T, carrier

§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)
Human Baseline (Mech-E)
n=4 senior engineers
0.8057
Zoo Text-to-CAD
Zoo Text-to-CAD
Zoo (KittyCAD)
0.63910
Claude Opus 4.7 → CadQuery
Claude Opus 4.7 → CadQuery
Anthropic + CadQuery 2.4
0.57111
Adam (CADcrush)
Adam (CADcrush)
CADcrush
0.52611
OpenAI o4 (reasoning) → CadQuery
OpenAI o4 (reasoning) → CadQuery
OpenAI + CadQuery 2.4
0.52312
DeepSeek R1 (reasoning) → CadQuery
DeepSeek R1 (reasoning) → CadQuery
DeepSeek + CadQuery 2.4
0.46312
GPT-5 → CadQuery
GPT-5 → CadQuery
OpenAI + CadQuery 2.4
0.43411
CAD-Coder R1
CAD-Coder R1
CAD-Coder Labs (research)
0.37616
Gemini 2.5 Flash → CadQuery
Gemini 2.5 Flash → CadQuery
Google + CadQuery 2.4
0.34214
Claude Sonnet 4.6 → CadQuery
Claude Sonnet 4.6 → CadQuery
Anthropic + CadQuery 2.4
0.33015
Gemini 2.5 Pro → OpenSCAD
Gemini 2.5 Pro → OpenSCAD
Google + OpenSCAD 2024.06
0.3150
Claude Opus 4.7 → OpenSCAD
Claude Opus 4.7 → OpenSCAD
Anthropic + OpenSCAD 2024.06
0.2660
DeepCAD
DeepCAD
Wu et al. 2021 (research)
0.26620
Claude Haiku 4.5 → CadQuery
Claude Haiku 4.5 → CadQuery
Anthropic + CadQuery 2.4
0.24723
Llama 3.3 70B → OpenSCAD
Llama 3.3 70B → OpenSCAD
Meta + OpenSCAD 2024.06
0.20725
GPT-5 Mini → OpenSCAD
GPT-5 Mini → OpenSCAD
OpenAI + OpenSCAD 2024.06
0.16030
Spline AI
Spline AI
Spline.design
0.0150
Trellis 3D
Trellis 3D
Microsoft Research
0.0000
no manifold solid produced
Qwen3 Coder → CadQuery
Qwen3 Coder → CadQuery
Alibaba + CadQuery 2.4
59
Hunyuan3D-2
Hunyuan3D-2
Tencent
0.000100

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
AgentWatert.Manif.FeatRecMating ClearanceParamEditP@1p50latencycost
Human Baseline (Mech-E)0.9670.9270.9260.8491.000591.4s$6.072
Zoo Text-to-CAD0.9430.7560.6390.7030.0005.1s$0.179
Claude Opus 4.7 → CadQuery0.9340.6830.6710.7570.00043.4s$0.327
Adam (CADcrush)0.9310.6570.6080.7390.00010.1s$0.223
OpenAI o4 (reasoning) → CadQuery0.9300.8090.7300.8280.00092.0s$1.306
DeepSeek R1 (reasoning) → CadQuery0.9160.6800.5670.7400.00083.7s$0.034
GPT-5 → CadQuery0.9170.6780.6570.6960.00031.9s$0.232
CAD-Coder R1×0.9110.6160.5410.5990.0006.0s$0.005
Gemini 2.5 Flash → CadQuery×0.9060.5380.5420.6550.00010.7s$0.020
Claude Sonnet 4.6 → CadQuery×0.9010.6920.6470.7370.00013.3s$0.068
Gemini 2.5 Pro → OpenSCAD×0.8980.5470.4530.5480.00032.4s$0.107
Claude Opus 4.7 → OpenSCAD×0.8900.5350.5140.6380.00026.6s$0.342
DeepCAD×0.8880.4550.3710.3170.0005.9s$0.022
Claude Haiku 4.5 → CadQuery×0.8850.5220.4400.5080.00010.2s$0.023
Llama 3.3 70B → OpenSCAD×0.8820.4110.3340.4050.00017.8s$0.017
GPT-5 Mini → OpenSCAD×0.8760.4100.3220.4800.00014.9s$0.009
Spline AI×0.8520.0990.0440.0490.0006.5s$0.038
Trellis 3D×0.8500.1950.0920.0550.00011.9s$0.044
Qwen3 Coder → CadQuery
kernel error: BRepCheck_NotClosed
×0.0000.00013.6s$0.026
Hunyuan3D-2×0.8500.1960.0990.0470.00044.2s$0.068