Models & Releases

Anthropic Redeploys Claude Fable 5 on July 1 After US Export Controls Lift, Adds New Cybersecurity Classifier

Anthropic is redeploying Claude Fable 5, its most capable generally available model. On June 30, it announced that US export controls had lifted. The controls had covered Claude Fable 5 and Claude Mythos 5. Fable 5 returned to users globally on Wednesday, July 1. Mythos 5 access is restored to a set of US organizations. The models were pulled on June 12. A US government directive restricted them to non-foreign-nationals. Anthropic could not verify nationality in real time. So it suspended bo

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Anthropic redeployed its most capable general-use AI model after US export controls that had restricted it were lifted. The model had been suspended after researchers found a method to bypass its safety safeguards, prompting the company to add a new classifier that blocks the reported technique in over 99% of cases. The incident highlighted a broader industry need for standardized ways to evaluate and score techniques that bypass AI model safeguards, which Anthropic is developing with other companies. Competing models from other developers gained ground during the suspension period, though performance and cost comparisons show varied strengths across different tasks.

Explainer: Claude Fable 5.1 Explained: Price, Changes and the Ban Story

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