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Artificial intelligence is playing an increasingly prominent role in Microsoft’s software development, with CEO Satya Nadella stating that AI now authors a significant portion of the company’s code. During a fireside chat with Meta CEO Mark Zuckerberg at Meta’s LlamaCon, Nadella estimated that 20% to 30% of Microsoft’s code is now “written by software.” This figure, shared in response to Zuckerberg’s query about AI’s contribution, highlights the accelerating adoption and integration of AI tools within large software companies and their substantial impact on code generation.