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legobench

The AI building benchmark

Big ideas. Small bricks.

See how AI builds Lego models from instructions and photos. Explore completed builds and their run details.

11benchmarks
55builds
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8 groups · 10 builds in Reference

Bugatti Chiron from instructions built by GPT 6 AstraInstructions

Bugatti ChironLEGO 75878

GPT 6 Astra Ultra

Codex CLI · v0.160.1

Build score

89.1%
Accuracy
13.7M tokens$19.1456m 51s
Bugatti Chiron from instructions built by GPT 6.1 SolInstructions

Bugatti ChironLEGO 75878

GPT 6.1 Sol Ultra

Codex CLI · v0.160.1

Build score

68.4%
Accuracy
18.1M tokens$3.761h 37m
Bugatti Chiron from instructions built by Claude Opus 5.5Instructions

Bugatti ChironLEGO 75878

Claude Opus 5.5 Xhigh

Claude Code · v2.1.293

Build score

50.0%
Accuracy
96.9M tokens$34.201h 52m
Bugatti Chiron from instructions built by Claude Sonnet 5.5Instructions

Bugatti ChironLEGO 75878

Claude Sonnet 5.5 Xhigh

Claude Code · v2.1.293

Build score

43.0%
Accuracy
156.5M tokens$28.603h 28m
Bugatti Chiron from instructions built by Claude Fable 5.1Instructions

Bugatti ChironLEGO 75878

Claude Fable 5.1 Max

Claude Code · v2.1.293

Build score

21.4%
Accuracy
39M tokens$91.012h 59m
Bugatti Chiron from instructions built by Claude Haiku 5.5Instructions

Bugatti ChironLEGO 75878

Claude Haiku 5.5 Xhigh

Claude Code · v2.1.293

Build score

19.1%
Accuracy
11.3M tokens$0.2215m 38s
Bugatti Chiron from instructions built by GPT 6 LunaInstructions

Bugatti ChironLEGO 75878

GPT 6 Luna Max

Codex CLI · v0.160.1

Build score

17.0%
Accuracy
120.1M tokens$1.793h 34m
Bugatti Chiron from instructions built by Grok 4.6Instructions

Bugatti ChironLEGO 75878

Grok 4.6 Xhigh

Grok Build · v1.0.46

Build score

14.7%
Accuracy
25.4M tokens$14.271h 4m