Anthropic capped Fable 5.2's AI-research capabilities in training, system card reveals
EntropyMagnets · reddit · 2026-11-10
A Reddit post highlights Anthropic's system card disclosure: while Claude Fable 5.2 / Mythos 5.2 advance general capabilities, training deliberately limited research skills that could most directly accelerate AI development — accelerator kernel optimization and LLM architecture work plateau at roughly Opus 5.5 level. Agentic coding, hardware development, and traditional ML/interpretability research were unaffected, no inference-time alteration is applied, and transparent fallbacks to Opus 5 cover select topics. The poster calls the belt-and-suspenders approach excessive and another argument for open-weight models.
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