Meta Muz prototype produced in just 1–2 weeks; seven months spent refining reliability before launch

Meta's personal AI agent Muse took only one to two weeks to build as a prototype, but the company spent seven months refining its reliability before launch, according to Chief AI Officer Alexandr Wang in an interview published October 11 by David Senra. Wang said the prototype was "sometimes amazing but mostly didn't work and kept breaking," noting that succeeding once or twice in a demo wasn't enough for a consumer product. Wang and Nat Friedman each wrote out their vision for a personal agent in February 2026, after which the team built the prototype and demonstrated it to the board, where some of Muse's design and the early form of its mascot took shape. The story underscores Meta's ($META) focus on product reliability over speed in its AI agent push, a key differentiator as consumer AI agents face scrutiny over inconsistent performance. Watch for Muse's launch metrics, user retention, and how Meta's reliability-first approach performs against faster-moving rivals in the personal AI agent market.