GPT-6 Astra leads Modelgrep’s 3D generation ranking

GPT-6 Astra leads Modelgrep’s September 2026 ranking for 3D generation, scoring 1481 Elo on Design Arena’s board for scenes and geometry generated as code. Kimi K3 follows at 1425, with Claude Fable 5.1 at 1423. The 56-point Elo lead over Kimi K3 translates to about 58 of 100 head-to-head votes.

The ranking covers 25 models and evaluates outputs for Three.js, WebGL and shaders, with human judges comparing models head to head. GPT-6 Astra is listed with 52.8 intelligence, 57 t/s speed, $10.00 input /M pricing and 1.1M context. Among the top 5 across design tasks, GPT-6 Astra also posts the strongest 3D score, followed by Kimi K3, Claude Fable 5.1, GPT-5.6 Sol and DeepSeek V4.1 Flash. Kimi K3 is identified as the highest-rated open-weight option, ranked #2 overall.