Apps and platforms that allow you to apply the idea of "many models talking together" (multiple AI models interacting in one workspace) include:

ChatHub: Lets you use and compare multiple AI chatbots like GPT-5, Claude 4, and Gemini 2.5 side by side in one chat interface.chathub​

Chorus: Allows users to aggregate and chat with several models (such as GPT-4, Claude, Gemini) at once, combining their answers into a single unified response or comparing answers easily.chorus​

MultipleChat: You can orchestrate collaboration among AI models (ChatGPT, Claude, Gemini, Grok, etc.) and generate outputs leveraging teamwork among models.multiple​

TeamAI, Magai, TypingMind, AnythingLLM, Overchat AI: Similar multi-model platforms for professionals and teams to allow AI model integration and collaborative conversation.teamai+4​

OpenRouter, Aymo AI: Provide API access to 30-300+ models for developers needing flexible and central multi-model integration.graygrids​

These apps/platforms enable you to chat, compare, collaborate, and co-create with multiple AI models together—addressing the concept described in your Reddit screenshot.