Suprmind offers a shared thread workspace combining Claude, GPT, Gemini, Grok,...

https://dibz.me/blog/research-symphony-reports-is-10000-words-in-15-to-30-minutes-real-1241

Suprmind offers a shared thread workspace combining Claude, GPT, Gemini, Grok, and Perplexity, giving you access to multiple AI models in one place. Plans start at $20/month, with a 7-day free trial and no credit card required