Mythos 5, Anthropic’s most advanced AI model, is once again available to select partners.
“Since June 12, we’ve been working closely with the US government to restore access to Claude Mythos 5 and Fable 5. Today, the government notified us that Mythos 5, our strongest cybersecurity model, can be redeployed to a set of US organizations that operate and defend critical infrastructure,” Anthropic tweeted on Friday. “We’re restoring access for these organizations quickly, and we’re continuing to work with the government to expand access to Mythos 5 and make Fable 5 available for general use again.”
As PCMag reports, access to Mythos 5 and its general-release counterpart, Fable 5, was cut off earlier this month following a government order. The Trump administration was reportedly concerned that a potential “jailbreak” would have allowed the model, which drew widespread attention for its ability to spot cybersecurity vulnerabilities, to be misused. The US was reportedly also concerned about Mythos being used by South Korea’s SK Telecom over alleged ties to China.
Anthropic said it was told to limit access solely to US nationals, meaning foreign nationals residing in the US couldn’t use it, forcing a total cutoff for all users. At the time, Fable 5 users were given no timeline for when it would become available again, with Anthropic saying only that it was “working with the government.”
In a letter to Anthropic Chief Compute Officer Tom Brown shared with Semafor, Commerce Secretary Howard Lutnick said he had “determined that appropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 model” following “significant progress” in talks between the AI firm and the government.
However, unlike Fable 5, Mythos 5 was never given a wide release and has so far only been made available to selected partners, such as cybersecurity labs.
We could be seeing the aftereffects of the Trump administration’s actions for some time. A legal technology firm called Legion recently filed a lawsuit against the government, claiming that losing access to Fable 5 caused “immediate, irreparable and existential” harm to the company.
Anthropic also recently accused Chinese tech giant Alibaba of attempting to illicitly extract its Claude AI model capabilities, Reuters reported.
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