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

https://charlie-wiki.win/index.php/%E2%80%9C51.4%25_Contradicted%E2%80%9D:_What_That_Number_Really_Tells_Us_About_AI_Answer_Reliability

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.