Anthropic has introduced Claude Fable 5.1 and Mythos 5.1, two versions of the same AI model with different safety features. These new releases reduce cache read prices by 75%, while achieving a score of 52.6% on a scientific research benchmark, compared to 24.7% for the previous iteration. Additionally, the models’ outputs are watermarked in compliance with the EU AI Act, and a detection API is available in private preview for select users.
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