Voxtral Mini 3B 2507 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.
Voxtral Mini 3B 2507, from Mistral AI, is priced at $0.000017/second 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.