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.
#82 of 200 in Embeddings.
On MTEB English v2 · Pair Classification · English, Stella En 400M v5 scores 87.2 vs 87.2 — about the same.
Released 2024-07-12. 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.
Stella En 400M v5 is an open-weights embeddings & retrieval model from NovaSearch, released Jul 2024.
Voyage Large 2 Instruct (better), QZhou Embedding (open weights).