Suprmind offers a unified workspace that includes Claude, GPT, Gemini, Grok,...

https://wiki-mixer.win/index.php/Is_There_a_Claude_Alternative_with_a_7-Day_Trial_and_No_Credit_Card%3F

Suprmind offers a unified workspace that includes Claude, GPT, Gemini, Grok, and Perplexity in a single shared thread