They used to publish some benchmarks on their site, but seem to have removed them. You can find them on archive.org[1]. I guess it is understandable, since vector search performance is pretty unpredictable, and depends on a lot of factors. If their target market is people who want vector search without needing to read a bunch of papers first, benchmarks might be more confusing than they are helpful.

edit: While I do think it's understandable, it's not great for transparency. Even if they don't want to open-source their index, I would admire it if they were willing to give ann-benchmarks[2] an API key to publish some independent results.

Disclaimer: I work on vector search at a different company

[1] https://web.archive.org/web/20210227105542/https://www.pinec... [2] https://github.com/erikbern/ann-benchmarks