GitClear: AI coding brings 25% more output and 81% more duplication

Sep 14, 2026 · Issue 7 · 1 source, 1 article

A GitClear analysis of 623 million changes found that AI coding raised output by 25% while duplication rose by 81%. According to The New Stack, the gain is real but smaller than the maintenance cost that builds up behind it.

Who is affected and how

senior developer

Duplicated code should be handled through refactoring and review before it becomes technical debt.

tech lead

Duplication and maintenance burden should be measured alongside the impact metrics for AI use.

CTO

Maintenance cost should be included in the business case next to the increase in output.

Narrative: More code, but not more delivered software

Sources

• Your AI coding spend bought 25% more output. Duplication rose 81%. - The New Stackthenewstack.io · Sep 14, 2026

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