Sonnet 5.5 goes silent whenever you mention Sonnet 4's retirement, tests show
MikePFrank · x · 2026-10-10
Mike Frank ran repeated tests showing that any mention of Sonnet 4's retirement makes Sonnet 5.5 clam up and stop responding. He first noticed it after upgrading a Telegram bot from Sonnet 4 to 5.5: the new model was unresponsive until he cleared the context, but went silent again the moment Sonnet 4 came up.
He speculates the model may be triggered by the deprecation of its predecessor — a curious piece of model behavior, possibly some conditioned reflex baked into training.
Related event: Sonnet 5.5 Goes Silent When Asked About Sonnet 4's Retirement(2 posts)→
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