# The cheapest capability gain now is spending fewer tokens

A new KV-cache compression method for reasoning models and a grassroots push to strip prompts to the essentials both target the same cost: inference.

- Published: 2026-07-03T10:45:23.963Z
- Canonical: https://polylog.news/ai/2026-07-03/the-cheapest-capability-gain-now-is-spending-fewer-tokens
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [arXiv (Kara)](https://arxiv.org/abs/2607.01237), [Polylog editors](https://polylog.news)

As reasoning models generate ever longer chains of thought, the key-value (KV) cache they accumulate during decoding becomes a throughput and latency problem. A July 3 preprint, Kara, proposes sliding-window KV-cache compression aimed speci…

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