There is no per-unit API price: price not verified.
#142 of 200 in Embeddings.
On LongEmbed · Mean over tasks · English, E5 Base 4K scores 54.5 vs 55.4 — about the same.
Released 2024-03-28. It is the current version in its line.
Yes, the weights are open (MIT licence).
The weights are open and can be self-hosted; hardware needs are not confirmed yet.
E5 Base 4K is an open-weights embeddings & retrieval model from dwzhu, released Mar 2024.
Bge M3 (better), Uibk Embedding v1 (open weights).