Anthropic said it will make Claude Fable 5’s safeguards for frontier LLM development visible after researchers and developers criticized an initial policy that could silently reduce the model’s effectiveness on requests tied to building advanced AI systems. The company launched Claude Fable 5 on June 9 as the first widely available Mythos-class model, with restrictions that redirect some cybersecurity, biology and chemistry prompts to Claude Opus 4.8, a less capable model. The disputed safegu...

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