a16z published an essay arguing AI is turning the CFO from scorekeeper into a builder of the company's "operating system," as easier data access and AI-native finance tools compress deployment from quarters to days and push reporting toward continuous, real-time closes. It cites Anthropic's finance team maintaining 70-plus finance-specific AI skills treated like production code — one of which produces a 90–95% complete monthly financial review in about 30 minutes — and OpenAI CFO Sarah Friar's team building custom GPTs and live dashboards for investor relations and procurement. The piece also highlights a16z portfolio companies including Rillet, Concourse, Lio, Stuut, Sphere, Petual and CFO.ai, and describes a rising "finance engineer" role using Codex or Claude Code, with lean teams targeting roughly 2% of headcount versus the traditional 5%.