There is no per-unit API price: self-host only.
There is no free API. The weights are open, so you can run it yourself.
#141 of 200 in Embeddings.
On MTEB English v2 · Reranking · English, Jina Embedding S En v1 scores 45.5 vs 45.5 — about the same.
Released 2023-07-07. It is the current version in its line.
Yes, the weights are open (Apache-2.0 licence).
The weights are open and can be self-hosted; hardware needs are not confirmed yet.
Jina Embedding S En v1 is an open-weights embeddings & retrieval model from Jina AI, released Jul 2023.
All Mpnet Base v2 (better), Yuan Embedding 2.0 En (open weights).