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They should've tested other embedding models, there are better ones than openai's (and cheaper)

Which do you suggest?

yep

You should use RTEB instead. See here for why: https://huggingface.co/blog/rteb

Voyage-3-large seems like SOTA right now

The Qwen3 600M and 4B embedding models are near state of the art and aren't too computationally intensive.