Lyria 3 Clip Preview and GPT Audio Mini are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Lyria 3 Clip Preview, from Google, has a 1,048,576-token context window and is priced at $0.04/song on OpenRouter.
GPT Audio Mini, from OpenAI, has a 128,000-token context window and is priced at $0.60/M tokens input, $2.40/M tokens output on OpenRouter.