How I Cut My AI API Bill by 40% Without Changing a Single Line of Application Code (opens in new tab)

Last month my AI API bill hit a number that made me close my laptop and go for a walk. I wasn't doing anything crazy — just running a mid-size AI SaaS product with a few thousand daily requests across GPT and Claude. But between the two providers, my monthly spend had crept up to around $800, and the billing dashboards from each provider told completely different stories. The thing is: I didn't need to rewrite my application. I didn't need to optimize prompts. I didn't need to switch models. ...