Gemini Embedding 001 and Text Embedding 3 Large are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Gemini Embedding 001, from Google, has a 20,000-token context window and is priced at $0.15/M tokens on OpenRouter.
Text Embedding 3 Large, from OpenAI, has a 8,192-token context window and is priced at $0.13/M tokens on OpenRouter.