Cybersecurity Experts Ask Feds to Lift Restrictions on Mythos
Cybersecurity Experts Ask Feds to Lift Restrictions on Mythos
Publish Date: 2026-06-15 19:10:00
Source Domain: www.pymnts.com
More than 120 cybersecurity and other tech professionals have signed an open letter asking the federal government to lift the export control directives on Anthropic’s Fable and Mythos large language models and commit to a new process for assessing artificial intelligence (AI) risk.
The open letter is dated Sunday (June 14) and addressed to Commerce Secretary Howard W. Lutnick and National Cyber Director Sean Cairncross.
The letter followed Anthropic’s Friday (June 13) announcement that it disabled some access to its Fable 5 and Mythos 5 AI models in response to a U.S. government export control directive, which called on the company to suspend access to those models by “any foreign national,” whether within or outside the United States, Anthropic employees included.
The company had launched the model four days earlier, on Tuesday (June 9), saying that it had developed safeguards to prevent them from being misused for purposes related to cybersecurity, biology and chemistry, and distillation.
Joe Levy, CEO of cybersecurity firm Sophos, shared a link to the open letter in a Monday (June 15) post on LinkedIn, saying that he and many colleagues from across the security community had signed it.
The open letter said that the signers believe AI is having significant impacts on cybersecurity, that Anthropic’s Mythos models are good at finding flaws but are not uniquely good at it, and that Anthropic has built protections into the Fable model to prevent its use for cyber offensive purposes.
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The signers also believe that it is essential to provide AI to coders and security teams, that Chinese open-weight models are only months behind the best American models, and that it is dangerous to keep the best capabilities from defenders when adversaries are making rapid advances, according to the letter.
In the case of the action taken on Anthropic’s Fable and Mythos models, the letter said that the signers believe that…
