A warning from Amazon led the White House to shut down Anthropic’s Mythos model

A warning from Amazon chief executive Andy Jassy, concerns about unauthorized Chinese access, and cybersecurity fears all reportedly led the Trump administration to cut off foreign access to Anthropic’s powerful new AI model, Fable 5.

According to multiple media reports, Jassy first raised concerns about the model with senior administration officials on Thursday after Amazon researchers used a series of prompts to get the Mythos-class model to provide information about cyberattacks that was supposed to be restricted.

It is unclear if Amazon was testing Fable for vulnerabilities in response to a White House request or if the company conducted the tests completely of its own accord. Politico quoted an unnamed source familiar with Amazon’s discussions as saying the government asked Amazon for feedback on the new Anthropic model.

An Amazonspokesperson previously told Fortune: “As a leading cloud provider that serves a large number of priv...