Instantly.ai + ChatGPT: AI Email Sequences Guide Connect Instantly.ai to the OpenAI API through Make.com, Zapier, or a script. Setup takes 30-60 minutes and lifts reply rates by 30-80% over generic copy. May 21, 2026 • Luka Mrkić Instantly.ai ChatGPT cold email automation Instantly.ai integration ChatGPT email sequences