“I would guess that sometime in the next 12 to 18 months, we'll reach the point where most of the code that's going toward these efforts is written by AI. And I don't mean autocomplete... you give it a goal, it can run tests, it can improve things, it can find issues, it writes higher quality code than the average very good person on the team already.”
Said Apr 29, 2025Deadline Oct 31, 2026Dwarkesh Podcast — 'Mark Zuckerberg — AI will write most Meta code in 18 months', April 29, 2025
The 18-month window closes at the end of October 2026. Zuckerberg's claim is scoped to code going toward Meta's AI/Llama efforts, not all Meta code, and Meta has not published a verifiable figure for the AI-written share.