Llama Guard 4 12B and Muse Spark 1.1 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Llama Guard 4 12B, from Meta Llama, has a 1,048,576-token context window and is priced at $0.18/M tokens input, $0.18/M tokens output on OpenRouter.
Muse Spark 1.1, 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.