Muse Spark 1.2 and Nex-N2-Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Muse Spark 1.2, from Meta, has a 1,048,576-token context window and is priced at $1.25/M tokens input, $4.25/M tokens output on OpenRouter.
Nex-N2-Pro, from nex-agi, has a 262,144-token context window and is priced at $0.25/M tokens input, $1/M tokens output on OpenRouter.