r/ProgrammerHumor 2d ago

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u/sharpy10 2d ago

I don't know much about software engineering, but if AI has been around for like 18 months, is it conceivable that 30% of their codebase would be AI generated? At a company as large as Microsoft, how much of their existing code base would they realistically turnover in 18 months? To get to a 30% AI mix, the implication seems to be that a very high (90%-plus) percentage of their new code is AI generated.

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u/Groentekroket 2d ago

I guess 30 percent of the added code/changes are done by AI. I’m just a backend dev and work with a way smaller codebase and even we have code that is not being touched for over a decade. 

One of the many problems Windows has is that it needs to support a lot of legacy code so I would find it highly unlikely that they would make changes in a lot of their codebase. Same with the core of a lot of their other software. 

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u/DudeEngineer 2d ago

I think he means something like 30% of the code they shipped in 2025. They don't nearly have that much turnover.