AWS rolls out metadata filtering before S3 vector searches

Published Wednesday, September 30, 2026 · 7:08 PM EDT

AWS is rolling out metadata pre-filtering for Amazon S3 Vectors, evaluating filters before similarity searches rather than after them. The company says selective filters can return up to 5x more matching vectors. A new prefix operator also supports filtering values such as paths and URLs. Indexes in new vector buckets use pre-filtering by default; existing indexes can be updated in place or tested with a per-query setting. The feature carries no additional cost in supported commercial and China regions. AWS expects deployment to finish in the coming days.

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