Atoms 官方最新动态：Prompt Caching for Agents: Stable Prefixes and Real Savings

来源：Atoms 官方动态 | 发布日期：2026-10-13T00:00:00.000Z

核心更新概览

Prompt caching reuses processing associated with an unchanged portion of a model request. It can reduce repeated input work when an agent sends the same instructions, tools or reference material acros

详细内容记录

Prompt caching reuses processing associated with an unchanged portion of a model request. It can reduce repeated input work when an agent sends the same instructions, tools or reference material across requests. Start by identifying a stable prefix, then measure actual cache usage and billed cost. Do not assume that every repeated request qualifies or that a cache hit means the answer itself was reused. Claude's prompt-caching documentation describe provider-specific behavior. Keep thresholds, retention and prices tied to the provider and model you actually use rather than transferring settings between them. Separate caching from memory and saved answers These features solve different problems. An answer cache returns a previously saved result when the application considers another question equivalent. Persistent memory stores information that a later task can retrieve. Prompt caching concerns repeated processing of eligible request input. Consider a customer-support agent that repeatedly receives the same product manual and instructions. Its user question changes on each request. A reusable prefix may reduce input-processing cost while the model still generates a new answer for that question. The application must continue checking that the manual version is appropriate and that private context belongs to the current user. Avoid treating caching as a factual freshness mechanism. If a product policy changes, the application needs to update the supplied material. Efficiently processing an outdated manual still produces a workflow with outdated evidence. Record the source version independently of cache status. Put stable material before changing task data

更多技术细节可访问官方原文：https://atoms.dev/blog/prompt-caching-agent-cost-guide。