Gemini Embedding 2 and E5-Large-v2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Gemini Embedding 2, from Google, has a 8,192-token context window and is priced at $0.20/M tokens on OpenRouter.
E5-Large-v2, from intfloat, has a 512-token context window and is priced at $0.01/M tokens on OpenRouter.