Rumor: Anthropic deliberately capped Fable/Mythos 5.2 research capabilities to avoid triggering RSI
TinfoilTricorn · x · 2026-11-10
WesRoth highlighted an unverified Anthropic-style model note claiming Claude Fable 5.2 and Claude Mythos 5.2 were deliberately constrained during training: on capabilities that most directly accelerate AI development—accelerator kernel optimization and LLM architecture improvements—the models were held to roughly Opus 5.5 level.
Key points:
- Agentic coding, hardware development, and traditional AI/ML research (including interpretability) were reportedly left untouched;
- Community reading: this explains why Anthropic thinks "RSI is imminent"—an uncapped model above Opus 5.5 might be equivalent to releasing a self-replicating frontier model.
Note: the Fable/Mythos naming and the document's authenticity are unconfirmed; treat as speculation.
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