Gemini Embedding 001 and GPT-5 Pro 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.
GPT-5 Pro, from OpenAI, has a 400,000-token context window and is priced at $15/M tokens input, $120/M tokens output on OpenRouter.