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.
#147 of 200 in Embeddings.
On MTEB Polish v1 · STS · Polish, Mmlw Roberta Base scores 70.7 vs 70.8 — about the same.
Released 2023-11-17. 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.
Mmlw Roberta Base is an open-weights embeddings & retrieval model from sdadas, released Nov 2023.
Jina Embeddings v3 (better).