Tech
How coding agents like Cursor quietly cut input costs by reusing KV states across turns — and what actually breaks the cache
Why my Cursor bill looked weird
I was poking around my usage dashboard in Cursor and noticed a metric I'd never paid attention to before: Cache Read .
Date Type Model Tokens
May 2, 06:50 PM Included auto 898K → Cache Read
May 2, 06:49 PM Included auto 1.4M → Cache Write
May 2, 06:47 PM Included auto 346.8K → Input / Output
Almost 99% of my input tokens for that session were served from cache. That sent me down a rabbit hole on w...
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