E5-Large-v2 and all-mpnet-base-v2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
E5-Large-v2, from intfloat, has a 512-token context window and is priced at $0.01/M tokens on OpenRouter.
all-mpnet-base-v2, from sentence-transformers, has a 512-token context window and is priced at $0.005/M tokens on OpenRouter.