Rumor: Claude Sonnet 5.5 Extra secretly routes to new checkpoint, knows Karpathy joined Anthropic in 2026
ChrisGPT · x · 2026-11-08
ChrisGPT reports that Claude Sonnet 5.5 Extra, without web access, correctly answered that Andrej Karpathy joined Anthropic's pretraining team in May 2026 to speed up pretraining research — while Opus 5.5 Extra knows nothing and appears patched. Reproduced on three accounts, he concludes the newest checkpoint is being routed to Sonnet Extra, and follow-up testing suggests it performs 'a bit too good for a Sonnet checkpoint'. Unverified rumor, but screenshots show specific, detailed answers.
Related event: Claude Checkpoint Leaks Karpathy's Alleged Anthropic Move Offline(4 posts)→
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