Mercury 2.5 Preview and Nemotron 3.5 Content Safety are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Mercury 2.5 Preview, from inception, has a 260,000-token context window and is priced at $0.04/M tokens input, $0.15/M tokens output on OpenRouter.
Nemotron 3.5 Content Safety, from Nvidia, has a 128,000-token context window and is priced by the provider serving it on OpenRouter.