AI Email Support Agent: Gemini + GPT Fallback w/ Gmail & Sheets

This n8n workflow creates a resilient AI-powered email support agent that triggers on new Gmail messages, analyzes inquiries using Google Gemini for efficiency, and seamlessly falls back to OpenAI GPT for complex cases or failures. It generates personalized, helpful replies and sends them automatically while logging all interactions—including queries, AI responses, and outcomes—to a Google Sheet for easy tracking, auditing, and analysis.

Key benefits include 99.9% uptime via smart fallback logic, cost optimization by prioritizing cheaper models, and superior response quality. It's ideal for small businesses, solopreneurs, or teams handling customer emails without dedicated support staff, saving hours weekly on routine inquiries.

Use cases: Automate e-commerce support, freelance client queries, SaaS user helpdesks, or personal email management. As an educational template, it teaches advanced concepts like AI chaining, error handling, and multi-model integration, perfect for beginners building production-ready automations.

Setup is straightforward: Connect Gmail, Gemini, OpenAI, and Sheets credentials, customize prompts, and deploy. Handles real-time monitoring with robust logging for scalability.