Nova-3 and GPT-4o Mini Transcribe are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Nova-3, from deepgram, is priced from $0.0043/minute on OpenRouter.
GPT-4o Mini Transcribe, from OpenAI, has a 128,000-token context window and is priced at $1.25/M tokens input, $5/M tokens output on OpenRouter.