Claude designed Sakura Garden, with a five-story pagoda, a koi pond, and cherry trees in 2,175 pieces.
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Watch On “Give an AI agent a model idea. Guide it, let it build it,” according to the GitHub project’s README. The Sakura result arose from a prompt to Claude Opus 5.5 asking for “the most beautiful model that comes to your mind.” Antelo posted the project on Friday afternoon as the first release after getting the toolkit to work after three earlier attempts.
LDraw, according to Antelo, is a text format where each LEGO piece placed is positioned with one line. LDView, LeoCAD, and Studio can open it, one file per model. An agent writes a plan in JSON that fully describes the model and submodels, creates a Python program from it, then generates the LDraw source output. When the model is rendered as an image, the agent can inspect, adjust, and render again, looping until the model is considered complete. In this way, it avoids “(evil!) geometry math,” as agents are “better at generating Python code.”
LDraw Nova runs as a Docker web app that works with AI providers including OpenAI, Anthropic, and OpenRouter. The web app’s gallery credits each build to the model that made it, with its prompt: Sakura Garden and an unfinished Atlas Crane to Opus 5.5, a Cathedral and the Tidal Observatory to Astra, and the Copper Bean apartments to Opus 5 “(not 5.5!).” The project itself was built with the assistance of OpenAI’s Astra and Anthropic’s Claude Opus 5.5.
Building the larger models for real would mean collecting thousands of parts, a task Antelo figures would be difficult. The project has limitations, too, as “physics modeling is something Nova is currently lacking,” which means collisions are handled, but stability is not. It isn’t free to run, either: his “wild” estimate for Astra building one Technic mechanism is around $5 in token costs.
OpenAI’s GPT-6 Astra model autonomously completes Portal in 24 hours
Key considerations
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Reference reading
- https://www.tomshardware.com/tech-industry/artificial-intelligence/SPONSORED_LINK_URL
- https://www.tomshardware.com/tech-industry/artificial-intelligence/open-source-tool-designs-lego-builds-with-more-than-2-000-real-pieces-their-programs-output-detailed-cad-files-but-no-models-have-been-built-yet#main
- https://www.tomshardware.com/membership
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