Suprmind offers a workspace combining Claude, GPT, Gemini, Grok, and Perplexity...

https://www.protopage.com/peter.collins#Bookmarks

Suprmind offers a workspace combining Claude, GPT, Gemini, Grok, and Perplexity in one shared thread. It provides a practical alternative for teams wanting multi-model access at $20/month with a 7-day free trial—no credit card needed to evaluate.