Weekly AI Observations: 2025 Year-End Model Selection Guide

It’s the first day of Thanksgiving break—thanks for reading. Last week’s vibe coding interview piece became my most-read article ever, thanks to Ruanyifeng for featuring it in his tech weekly. This week I want to talk about model selection for AI apps at the end of 2025. It’s critical: it drives both quality and cost. Don’t shrug off the difference between $0.20 and $0.25 per million tokens—that’s…