Resources

Known gaps

What this release does not cover.

Honest limits of release 2026-09.2.

Changelog is empty. First load. GET /v1/changes will start filling on the next release.
Authors are sparse. Some editions still return authors: []. Open Library keys are resolved to names on read when we can.
Subjects and edition metadata are sparse. publisher, publication_date, page_count, format are often null.
Synopses cover a slice. About 8.4M of 78.2M works have description.
Split works. Open Library split some popular titles into several work ids. Match and search collapse those when the title is an exact hit.
One source. Open Library only. Library of Congress and BookBrainz are not in this release.
Recommendations are content similarity, not other readers’ shelves. About 1.28M ISBN+synopsis works have embedding neighbors (~64M rows). Open Library ratings/reading-log counts bias ranking; that is not collaborative filtering. Seeds with no neighbor rows return { results: [] } — no subject-keyword fallback.
Genre browse uses edition subjects. genre=fantasy works when subjects mention fantasy/magic/etc. Fiction, general does not map to a facet.
Work merge is incremental. Split fds_wk_* collapse in the fetch window today; aliases land in hash buckets, not a 78M re-ER.
Resale is prohibited. Bulk dumps are for your own systems.

What is solid