Matt Shumer launches first Opus 5.5 Gauntlet Loop, live-testing the model to redesign his site
mattshumer_ · x · 2026-09-23
AI founder Matt Shumer has kicked off the first "Opus 5.5 Gauntlet Loop": an iterative live test where Opus 5.5 repeatedly redesigns his own newsletter site, somethingbig.ai.
He'll post each round's results in the thread, making it a public benchmark of the model's ability to handle long, multi-turn agentic tasks on a real website without human intervention.
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