To learn how zero data retention (ZDR) applies to this feature, see API and data retention.
Search result content blocks let Claude cite your own content the same way it cites web search results: each citation carries the source and title you provided. Use them in RAG (Retrieval-Augmented Generation) applications where Claude needs to attribute answers to your documents.
All active models support search results with citations, with the exception of Claude Haiku 3. No beta header is required: search results are part of the standard Messages API.