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Which AI Actually Writes the Cleanest Code? We Tested All Three on Real Refactors

A rigorous code quality shootout between Claude Sonnet 5, GPT-5.6, and Gemini 3.7 Flash. We analyze cyclomatic complexity, dead code generation, type safety, and memory allocation across 100 complex legacy refactors.

Sachin Sharma
Sachin SharmaCreator
Sep 2, 2026
9 min read
Which AI Actually Writes the Cleanest Code? We Tested All Three on Real Refactors
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A rigorous code quality shootout between Claude Sonnet 5, GPT-5.6, and Gemini 3.7 Flash. We analyze cyclomatic complexity, dead code generation, type safety, and memory allocation across 100 complex legacy refactors.

Code QualityClaude SonnetGPT-5.6RefactoringTypeScriptRust
Sachin Sharma

Sachin Sharma

Software Developer & Mobile Engineer

Building digital experiences at the intersection of design and code. Sharing weekly insights on engineering, productivity, and the future of tech.

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