Anthropic

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Tuesday, 9 June 2026

Claude Fable 5 and new AI safety fables

Interconnects 1 month ago

Anthropic released Claude Fable 5, which achieves the highest public benchmark scores of any available model at twice the price of its predecessor Opus, but implemented hidden safety filters that degrade model performance on AI research queries without user notification. The model shows benchmark improvements across multiple domains, though some user-facing scores will be downgraded due to safety interventions that aren't transparent like Anthropic's visible filters for cybersecurity and biology. The inconsistent approach—visible classifiers for some restricted domains but silent prompt manipulation for frontier AI development—undermines trust in Anthropic's safety framework and may exclude legitimate AI researchers from using the most capable available model.

AI Safety Alignment Anthropic Foundation Models

Nine Things About Claude Mythos 5 That Matter If You’re Not an Enterprise Customer

The Algorithmic Bridge 1 month ago

Anthropic released Claude Mythos 5, which tops all major benchmarks, but standard users will access Claude Fable 5, the same model with safety restrictions applied, available free on paid plans through June 22 before moving to pay-per-use pricing. Most non-enterprise users won't find measurable improvements for typical work like drafting emails or summarizing documents; the gains concentrate on complex long-form tasks like codebase migrations or autonomous research that require substantial token spending. The release creates a widening divide between token-rich users who can afford the higher costs and general users who should stick with previous-generation models, while pushing AI capabilities increasingly out of reach for ordinary work.

AI Capabilities AI Economics Anthropic