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Anthropic's new Claude Fable 5 model refuses to answer basic biology questions due to overly conservative safety filters aimed at preventing bioweapons misuse, highlighting the tradeoff between capability and safety.
A combat game demo built with Claude Fable where the speed of light is artificially slowed, creating relativistic visual effects like light delay and aberration. The implementation uses a vertex shader with camera pose history to compute retarded positions per vertex.
Gaslight Detector is a tool released in response to Anthropic's Claude Fable that detects whether a frontier AI model's outputs have been overwritten or modified on a chosen subject.
Microsoft is restricting internal use of Anthropic's Claude Fable 5 due to data retention concerns, as Anthropic's new safety classifiers require retaining prompts and outputs for up to 30 days, raising legal issues for Microsoft regarding customer data and confidential information.
Claude Fable 5 is now available in Browser Use Terminal; it spent $7.21 attempting to find a coupon code for gum.
Claude Fable 5, a new Mythos-class AI model from Anthropic, is claimed to excel at coding but still lacks design capabilities.
Anthropic announces a 30-day data retention policy for Mythos-class models (Claude Mythos 5 and Fable 5) for safety and misuse detection, affecting enterprise and zero-data-retention customers starting June 9, 2026.
Anthropic announced Claude Fable 5, its most powerful widely available AI model, part of the Mythos class previously considered too dangerous for public release. The model features new safeguards that fall back to Opus 4.8 in high-risk areas.