The Gross Margin Episode with Sarah Wang of a16z

Gross margins, GPUs, and the future of finance — this one’s for the metrics nerds. CJ sits down with Sarah Wang, General Partner at Andreessen Horowitz, to talk about what happens when the traditional SaaS playbook collides with AI. Sarah shares how legacy benchmarks like payback period and burn multiple start to break down in a world where compute, not headcount, drives costs. She explains why sky-high gross margins can actually be an orange flag, how finance leaders can think about resource allocation between engineers and GPUs, and why the most valuable finance teams today are deeply operational. They also unpack what it’s like partnering with AI-native founders, the evolution of pricing models as LLM costs drop, and whether we’ll see a private trillion-dollar company anytime soon.—LINKS:on LinkedIn: https://www.linkedin.com/in/sarah-wang-59b96a7/Company: https://a16z.com/CJ on X (@cjgustafson222): https://x.com/cjgustafson222Mostly metrics: https://www.mostlymetrics.com—RELATED EPISODES:996 Culture, Exploding AI Bills & SaaS ChaosFrom Credit Karma to Notion: CFO Rama Katkar on Leading Finance Through Every Growth Stage5,762 Job Applications. Zero Offers.Thinking About Adding Payments to Your Software Product? Listen to This First!—TIMESTAMPS:(00:00:00) Preview and Intro(00:02:40) Sponsors – Fidelity Private Shares, Mercury, RightRev(00:05:50) Sarah Joins the Show(00:06:06) The Future of Excel in the Age of AI(00:08:24) Why Gross Margins Don’t Tell the Whole Story(00:10:42) When Sky-High Margins Are an Orange Flag(00:12:57) Finance as a Strategic Lever in AI Companies(00:15:04) Sponsors – Tipalti, Aleph, Rillet(00:17:22) Partnering with AI-Native Founders(00:20:35) When Traditional SaaS Benchmarks Break Down(00:23:58) Forecasting and Financial Planning for Compute Costs(00:27:16) The Engineers-Versus-GPUs Trade-Off(00:30:29) Resource Allocation and Infrastructure Efficiency(00:33:47) How Pricing Models Evolve as LLM Costs Drop(00:37:15) Circular Finance: When Big Tech Funds Its Own Vendors(00:40:39) Metrics That Still Matter in AI-Driven Businesses(00:44:12) The Evolving Role of Finance Leaders(00:47:26) What “Operational Finance” Really Means(00:50:58) Building Sustainable Efficiency in AI Companies(00:54:03) Will We See a Private Trillion-Dollar Company?(00:55:33) Outro—SPONSORS:Fidelity Private Shares is the all-in-one equity management platform that keeps your cap table clean, your data room organized, and your equity story clear—so you never risk losing a fundraising round over messy records. Schedule a demo at https://www.fidelityprivateshares.com and mention Mostly Metrics to get 20% off.Mercury is business banking built for builders, giving founders and finance pros a financial stack that actually works together. From sending wires to tracking balances and approving payments, Mercury makes it simple to scale without friction. Join the 200,000+ entrepreneurs who trust Mercury and apply online in minutes at https://www.mercury.comRightRev automates the revenue recognition process from end to end, gives you real-time insights, and ensures ASC 606 / IFRS 15 compliance—all while closing books faster. For RevRec that auditors actually trust, visit https://www.rightrev.com and schedule a demo.Tipalti automates the entire payables process—from onboarding suppliers to executing global payouts—helping finance teams save time, eliminate costly errors, and scale confidently across 200+ countries and 120 currencies. More than 5,000 businesses already trust Tipalti to manage payments with built-in security and tax compliance. Visit https://www.tipalti.com/runthenumbers to learn more.Aleph automates 90% of manual, error-prone busywork, so you can focus on the strategic work you were hired to do. Minimize busywork and maximize impact with the power of a web app, the flexibility of spreadsheets, and the magic of AI. Get a personalised demo at https://www.getaleph.com/runRillet is the AI-native ERP modern finance teams are switching to because it’s faster, simpler, and 100% built for how teams operate today. See how fast your team can move. Book a demo at https://www.rillet.com/metrics#RunTheNumbersPodcast #FinanceLeadership #AIinBusiness #VentureCapital #SaaSMetrics This is a public episode. If you would like to discuss this with other subscribers or get access to bonus episodes, visit cjgustafson.substack.com