DeepSeek update keeps cache hits mid-conversation, cuts costs 36.6%
teortaxesTex · x · 2026-09-11
- A hands-on test shows DeepSeek V4.1 Flash with the new DSH harness no longer busts prefix cache when the System Prompt changes mid-conversation.
- Across 20 six-turn comparisons in 5 scenarios: total tokens up only 2.4% while cost fell 36.6%; cache hit rate jumped from 0% to 88.3%, non-cached input dropped 56.8%.
- Author notes Codex already had similar behavior; DeepSeek is catching up on both model and harness.
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