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面向中文开发者的 Claude RAG 最新指南:解释什么时候可以直接用长上下文、Prompt Caching、PDF support 和 Citations,什么时候才值得做基础向量 RAG,什么时候需要升级到 Contextual Retrieval + reranking。
基于 2026-03-18 官方文档重写的 Claude API 速率限制指南,重点解释 RPM、ITPM、OTPM、429 与 acceleration limits,以及何时该用缓存、Message Batches、队列整形或直接升 tier。
Master GPT-5.2 API cost optimization with proven strategies including prompt caching (90% discount), batch API (50% off), intelligent model routing, and semantic caching. Complete implementation guide with code examples.
Master Claude 4 Opus API pricing with our comprehensive 2025 guide. Compare costs with GPT-4.1 and Gemini 2.5 Pro, discover 90% savings through prompt caching, and access exclusive discounts via laozhang.ai gateway. Real benchmarks and cost calculations included.