GTE-Base and R1T Chimera are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GTE-Base, from thenlper, has a 512-token context window and is priced at $0.005/M tokens on OpenRouter.
R1T Chimera, from tngtech, has a 163,840-token context window and is priced by the provider serving it on OpenRouter.