Gemini Embedding 2 and Embed V1 4B 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.
Embed V1 4B, from Perplexity, has a 32,000-token context window and is priced at $0.03/M tokens on OpenRouter.