Microsoft CEO Satya Nadella said that 20%-30% of code inside the company’s repositories was “written by software” — meaning AI — during a fireside chat with Meta CEO Mark Zuckerberg at Meta’s LlamaCon conference on Tuesday.

Nadella gave the figure after Zuckerberg asked roughly how much of Microsoft’s code is AI-generated today. The Microsoft CEO said the company was seeing mixed results in AI-generated code across different languages, with more progress in Python and less in C++.

Microsoft CTO Kevin Scott previously said he expects 95% of all code to be AI-generated by 2030.

When Nadella threw the question back at Zuckerberg, the Meta CEO said he didn’t know how much of Meta’s code is being generated by AI.

On Microsoft rival Google’s earnings call last week, CEO Sundar Pichai said AI was generating more than 30% of the company’s code. Of course, it’s unclear how exactly Microsoft and Google are measuring what’s AI-generated versus not, so these figures are best taken with a grain of salt.