OpenAI vs Gemini in Production: What I Learned Shipping AI Features Across 3 Real Products

I've used OpenAI in production across three products — 92% accuracy resume parsing in TMS, RAG pipelines with pgvector in aiPM, and recipe search in YesCozy. Here's what the comparison actually looks like when you're choosing a model for a real system with real accuracy and latency requirements, not a chatbot demo.