GPT-6 Now Remembers Your Chats Better — and Charges You Less

Every time you ask an AI a follow-up question, it normally re-reads everything you've said so far — your whole document, your whole chat history — before answering. Prompt caching stops that waste. Think of it like a waiter who writes your order down once, instead of asking you to repeat it every time you add a drink. The AI keeps a copy of the long text and jumps straight to answering.

GPT-6 improves that system in four ways. It hits the cache more often, meaning the AI successfully finds what it already knows. It adds diagnostics — basically a dashboard showing developers which parts are being reused and which are being re-read. It adds explicit breakpoints, so a developer can mark exactly where the memory should start and stop. And it adds controls to trade speed against cost.

Why should you care? Most AI products you use — a customer support bot, a tool that reads contracts, an assistant that summarizes your meetings — run on this plumbing. Faster caching means snappier replies and cheaper operation, which is the main reason AI subscriptions and per-use pricing can come down. Long documents become practical, because the AI isn't paying to re-read 50 pages for every small question.

The catch is that this is a developer feature, not something you'll see. You won't flip a switch or notice a new button. It also only helps when the same long text gets reused over and over — a one-off question gains nothing. And if the cached text goes out of date, the AI may confidently answer using stale information until someone refreshes it.