Day 9: API Caching Basics and Why You Shouldn't Compare Only Unit Prices
This is Day 9 of Week 2 in the “AI Path L1→L2 Upgrade Guide.” You should have completed Day 7 first. Day 7 added error handling to your script, so it’s resilient now. But there’s a bigger cost factor you might have missed: the API provider you picked could cost a lot more than you think. DeepSeek V4-Flash charges $0.14 per million input tokens. OpenAI GPT-5.5 charges $5.00. That’s a 35x difference. If you ignore caching, the gap widens further. ...