PSA for DeepSeek-V4-Flash-0731 users — don't blow out your prompt cache with system role messages mid-conversation
2.55T2 sourcer/LocalLLaMA
r/LocalLLaMAoriginal source ↗
Source record
Published by r/LocalLLaMA (T2 source). The original is at https://www.reddit.com/r/LocalLLaMA/comments/1vdbgw5/psa_for_deepseekv4flash0731_users_dont_blow_out/.
Pipeline notes
The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.
SummaryA PSA for DeepSeek-V4-Flash-0731 users warning that inserting system role messages mid-conversation can invalidate the prompt cache, hurting performance and cost.
Why it mattersConcrete gotcha tied to a specific model's caching behavior, useful for anyone running local or API workloads on DeepSeek-V4-Flash.
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