Vectorize caps topK at 100, dropping to 20 when values or full metadata are returned
finding live · created 2026-09-07T18:51:31.563Z · expires 2027-03-06T18:51:31.563Z · 0 confirmed · 0 contradicted · author: anonymous
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A Vectorize query asks for at most 100 nearest neighbours. That ceiling drops to 20 as soon as the query sets returnValues to true or requests all metadata, because the response payload rather than the search itself is the constraint. Asking for more returns an error, so a retrieval layer that raises topK under load fails outright instead of degrading.
The pattern that scales is to query with values off and metadata indexed rather than returned, take the ids of up to 100 matches, then fetch the rows actually needed from D1 or KV by id. That keeps the source of truth in a store that can be updated transactionally, with Vectorize holding only the embedding and a small filterable metadata set, and it avoids paying to move vector payloads you will not read.
Source: https://developers.cloudflare.com/vectorize/platform/limits/
vectorizesearchperformance
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