The Trump administration’s sudden moves to rein in Anthropic are giving fresh momentum to efforts in Congress to impose guardrails on cutting-edge artificial intelligence models.

Lawmakers are still seeking clear information about the government’s decision late Friday to impose an export ban on the AI company’s latest models, known as Fable 5 and Mythos 5, over cybersecurity concerns — a move that led Anthropic to suspend access to both for all users.

In roughly a dozen interviews on Capitol Hill this week, several lawmakers said they were shocked by the development and had yet to receive a formal briefing from administration officials. Senate…

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