Mistral Small 4 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.
Mistral Small 4, from Mistral AI, has a 262,144-token context window and is priced at $0.15/M tokens input, $0.60/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.