SWE, AI Automation Enthusiast. I test every AI coding agent so you don’t have to, what’s worth using, what it really costs, and what the docs won’t tell you.
notice this one detail on Z AI's pricing page
both GLM-5.3 and 5.3 Flash show the cache storage as "limited-time free"
so cache storage is free for now, but Z AI is clearly leaving the door open to charging for it later.
kimi K3 on bedrock already charges $3.75 for cache writes. if Z AI follows that direction, the effective cost of GLM jumps overnight without the listed price changing
when you're evaluating model pricing, the cache price is the one that can change the economics later