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

https://holdensimpressivethoughts.lumenforgex.com/posts/what-is-sequential-mode-in-suprmind-and-why-would-i-use-it

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.