I sent Claude Opus 5 "-" and it wrote me 5k tokens about a cartographer - Austin's Nerdy Things

Welcome to Austin’s Nerdy Things, where we send punctuation to a frontier AI model 649 times and take notes on what crawls out. The night of July 27th, a weird Claude behavior was making the rounds on X. A thread from @merlindru (187K views) flagged a strange Opus 5 failure mode around a specific text, […]

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