A developer has built a custom interface that drops three frontier AI models into a single shared conversation, where users summon a specific model with an @-mention and the models themselves tag one another to hand off work like colleagues on a team. The setup, demonstrated on July 20, 2026, places Anthropic's Claude Fable 5, OpenAI's GPT-5.6 Sol and Anthropic's Opus (Claude Opus 4.8) in the same chat window, replacing the familiar juggling act of running three models in three separate tabs and copy-pasting text between them.
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