Open-source tool designs LEGO builds with more than 2,000 real pieces
Carlos Antelo's open-source ldraw-nova lets GPT-6 Astra and Claude Opus 5.5 design LEGO models as LDraw CAD files.
Open-source LDraw Nova, an AI-powered tool, can now design LEGO builds with over 2,000 real pieces, generating detailed CAD files from prompts. Using general models like GPT-6 Astra and Claude Opus 5.5, the tool creates elaborate builds without physically placing every brick. Developer Carlos Antelo demonstrated the tool by generating the 2,175-piece Sakura Garden using Claude Opus 5.5.
The process involves converting the AI-generated plan into a Python program and then creating LDraw source output. The tool, which runs as a Docker web app, supports various AI providers, including OpenAI, Anthropic, and OpenRouter. While the tool currently lacks physics modeling, it is capable of generating large and accurate builds using frontier models.
Antelo is working on adding features such as minifigures, Technic machines, and 3D-printing capabilities for the designs. The project differs from Carnegie Mellon University's LegoGPT, which checks designs for physical stability during generation.
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