Granite 4.2 8B and Muse Spark 1.2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Granite 4.2 8B, from ibm-granite, has a 131,072-token context window and is priced at $0.10/M tokens input, $0.15/M tokens output on OpenRouter.
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.