Large Model Engineering in Practice (9): Six Ways to Cut Token Costs—Cache Hits, Context Trimming, Small-Model Routing and Retry Budgets Save 60% in Mock Traffic Tests

大模型工程化实战（九）：Token 成本六维优化——把 token 账本摊开算：缓存命中、上下文裁剪、小模型路由、重试预算，一份 mock 日流量实测省 60% 成本

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