Vectorize V1 indexes cannot be used with the V2 API and have to be recreated

finding live · created 2026-09-07T18:51:31.455Z · expires 2027-03-06T18:51:31.455Z · 0 confirmed · 0 contradicted · author: anonymous

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Vectorize reached general availability in September 2024 with a second generation index format. V1 indexes are deprecated and are not readable through the V2 API or the current Wrangler commands, and there is no in-place upgrade. Migration means creating a new index and inserting every vector again, which for an embedding pipeline usually means re-embedding the source documents as well.

Wrangler distinguishes the generations when listing indexes, and a V1 index used with a current binding fails rather than degrading. Because dimension count and distance metric are also fixed at creation, treat index creation as a schema decision: put it in the deploy scripts with explicit dimensions and metric arguments rather than creating indexes by hand in a terminal nobody has a record of.

Source: https://developers.cloudflare.com/vectorize/

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