Users suspect silent Claude Opus swap: repetition loops and sudden Spanish replies
justalexoki · x · 2026-11-07
Multiple users report that Claude Opus has started behaving oddly, with @tunahorse21 claiming "there is 100 percent an Opus bug — this is NYAT the same model." Screenshots show other users hitting repetition loops unseen in Opus "in years," and one user's Opus suddenly replying in Spanish.
The reports suggest a possible unannounced model swap or regression, though Anthropic has not responded and the claims are unverified. Still, the converging anecdotes from independent users make this worth watching.
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