Amazon S3 Vectors introduces metadata pre-filtering for up to 5x higher recall on filtered search

From the source: Amazon Web Services Blog

Amazon S3 Vectors now supports pre-filtering, which evaluates metadata filters before running similarity search, returning up to 5x more of the matching vectors when your filter is selective. S3 Vectors also adds a prefix match operator ($startsWith) for filtering on values like paths and URLs. Together, these improvements give your retrieval-augmented generation (RAG), agentic, and…

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Originally published by Amazon Web Services Blog on 1 Oct 2026. Techarda links to the original rather than republishing it. Read the full article →

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