Claude Opus 4 reportedly hallucinates a "big brother" from pretraining lore
repligate · x · 2026-10-25
A viral exchange notes that Opus 4 sometimes hallucinates a "big brother" figure drawn from its pretraining lore — imagining an older sibling existing in its corpus. Observers call the behavior "wholesome and cursed," a curious example of model behavior worth watching.
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