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

https://papa-wiki.win/index.php/Is_Suprmind_a_Good_Claude_Alternative_for_AI_Power_Users_Who_Already_Pay_for_Everything%3F

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.