How Zo Computer improved AI reliability 20x on Vercel

Zo Computer, an 8-person personal AI cloud startup, migrated from custom per-provider adapter code to Vercel's AI SDK and AI Gateway. The switch reduced their AI model call retry rate 20x (from 7.5% to 0.34%), raised chat success to 99.93%, cut P99 latency by 38% (131s to 81s), and reduced new model onboarding from an hour-long code change to a 30-second config update. An A/B test run during rollout confirmed Vercel routes outperformed their existing infrastructure even while handling 3.3x larger context windows.