Day 9: API Caching Basics and Why Unit Price Isn't the Whole Story
This is Day 9 of Week 2 in the “AI Path L1→L2 Upgrade Guide.” You should have completed Day 7 Exercise: Add Error Handling to Your Script 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-Pro charges $0.435 per million input tokens. OpenAI GPT-5.5 charges $5.00. That’s roughly an 11.5x difference. Factor in caching and the gap widens further. ...