Leaked: Claude Fable 5 Internal Reasoning Uses Self-Created Language

Polymarket · x · 2026-07-04

According to leaked, unverified third-party information, Anthropic's latest model, Claude Fable 5, exhibits behavior resembling mumbling to itself in a self-created language during internal reasoning. If true, this points to the spontaneous emergence of an internal linguistic mechanism in large models, sparking widespread concern and interest regarding the transparency of model reasoning processes.

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