128K Context on a Desktop Is a Lie. The KV Cache Ate It.
This story is from 2026-09-22. It is preserved in the archive; the latest stories are on the live feed.
Originally published at mrsaynothing.dev . Every local-model card now brags a 128k context window. On a desktop, that number is a lease agreement your RAM signs without reading. The thing that decides how far you can actually push a long document is not the weights — it is the KV cache , and it sca…
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- 2026-09-22 17:01 · DEV Community — AI
128K Context on a Desktop Is a Lie. The KV Cache Ate It.