Here is a concise, natural description that hits your requirements: Suprmind...

https://bizzmarkblog.com/is-suprmind-overkill-for-simple-writing-tasks-a-product-leads-perspective/

Here is a concise, natural description that hits your requirements: Suprmind lets GPT, Claude, Gemini, Grok, and Perplexity debate your ideas in one thread to catch logic gaps and blind spots