360 billion tokens, 3 million customers, 6 engineers

Durable migrated its AI business builder platform from self-hosted to Vercel, achieving 3-4x cost reduction while enabling a 6-person team to serve 3M customers handling 1.1B tokens daily. The consolidation solved critical multi-tenant challenges—model orchestration, context isolation, and per-customer cost attribution—while accelerating agent shipping and leveraging Vercel's AI SDK, Gateway, Workflows, and Skills.