Unverified50% confidenceTradeoffExact time
Perplexity采用在线RAG，不依赖预建索引库，在每次查询时实时触发网络爬取，代价是查询延迟相对更高
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/15/2026
First Seen
Valid until: 10/13/2026
Sources
Related Claims
UnverifiedPerplexity不仅检索预建索引，还能实时爬取网页内容78% similarUnverified由于Perplexity需要实时检索和生成答案，其延迟通常高于简单返回链接列表的传统搜索API74% similarUnverified在线RAG覆盖数小时内最新信息但查询延迟更高，离线RAG牺牲实时性换取毫秒级检索响应，两者代表不同的工程权衡73% similarUnverified传统RAG系统依赖预建索引，而实时信息流要求索引几乎零延迟更新72% similarUnverifiedGrep相比RAG的优势在于实时搜索避免索引时效性问题，且失败原因单一确定（关键词没匹配上），调试成本低72% similar
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