Mistral Small 4 and Nex-N2.5-Mini 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.
Nex-N2.5-Mini, from nex-agi, has a 262,144-token context window and is priced by the provider serving it on OpenRouter.