Mistral Large 3 2512 and Riverflow V2 Standard Preview are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Mistral Large 3 2512, from Mistral AI, has a 262,144-token context window and is priced at $0.50/M tokens input, $1.50/M tokens output on OpenRouter.
Riverflow V2 Standard Preview, from Sourceful, has a 8,192-token context window and is priced by the provider serving it on OpenRouter.