E5-Base-v2 and GPT-5 Image are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
E5-Base-v2, from intfloat, has a 512-token context window and is priced at $0.005/M tokens on OpenRouter.
GPT-5 Image, from OpenAI, has a 400,000-token context window and is priced at $10/M tokens input, $10/M tokens output on OpenRouter.