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 · STS · English, Jina Embedding S En v1 scores 78.2 vs 78.2 — 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.
EmbeddingGemma 300M (better), QZhou Embedding (open weights).