Tagged: Anthropic

Running Sevantia, our AI chat product, I watched the same 2,800-token system prompt get re-billed on every single user message. Multiply that by thousands of conversations a day and you're paying Anthropic to re-read the same instructions into Claude's context over and over. Prompt caching fixes this. It took me longer than it should have to get the mental model right, and the docs skip over the parts that trip up most people. This is the guide I wish I'd had when I first enabled it.

In May 2024, I published the first version of anthropic-php, a PHP client for Anthropic's Claude API. Nearly two years and 370,000+ downloads later, it's the most installed dedicated Anthropic SDK in the PHP ecosystem. This is the story of why I built it, what it can do, and why I think packages born from real necessity tend to be the good ones.