Anthropic caps GPU kernel optimization in Fable 5.2 training as a safeguard — community asks: pre or post nerf?
WolframRvnwlf · x · 2026-11-10
WolframRvnwlf amplifies superalesha's critique: Anthropic's Fable 5.2 / Claude Mythos 5.2 launch post lists accelerator kernel optimization and improving LLM architectures in its Safeguards section alongside hacking and biology, saying training limited the research capabilities that "could most directly accelerate AI development," leaving those areas "at about the level of Opus 5.5."
Critics ask whether that's a pre- or post-nerf number, and argue kernel work is what lets a used 3090 run new models and gets open weights to people who can't pay $40 per 1M output tokens. Notably, this cap happens during training — no refusal, no warning at inference. The thread frames it as frontier labs "pacing the frontier" by restricting general research capability in the name of safety.
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