There is no per-unit API price: API price not public.
There is no free API. The weights are open, so you can run it yourself.
#184 of 200 in Embeddings.
On MTEB English v2 · Retrieval · English, German Semantic STS v2 scores 17.8 vs 18.1 — about the same.
Released 2022-11-17. It is the current version in its line.
Yes, the weights are open.
The weights are open and can be self-hosted; hardware needs are not confirmed yet.
German Semantic STS v2 is an open-weights embeddings & retrieval model from aari1995, released Nov 2022.
EmbeddingGemma 300M (better), Yuan Embedding 2.0 En (open weights).