San Francisco, California - Anthropic said Friday it had received authorization from the US government to allow a small group of American cybersecurity firms to access its powerful AI model Mythos 5.

Access to Mythos 5 had been blocked by US authorities due to concerns about national security.

Anthropic will continue discussions with the Donald Trump administration to "expand access to Mythos 5 and make Fable 5 available again" to the general public, a company spokesperson said.

The government abruptly forced Anthropic to cut off access to its two cutting-edge artificial intelligence models on June 12 after discovering vulnerabilities in the safeguards put in place to prevent misuse of the tool.

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The strong action against Anthropic has drawn accusations of government overreach.

Secretary of Commerce Howard Lutnick said in a letter to the company, cited by Politico and Reuters, that "Anthropic has worked with the US government to address risks associated with the Covered Models."

"These efforts have yielded significant progress," he said.

Commerce Department spokesperson Benno Kass said, "We have worked diligently to ensure America remains the global leader in AI while safeguarding our security."

Anthropic angered Trump's team in an earlier clash by refusing to allow its technology to be used for mass surveillance and autonomous weapons, leading the Pentagon to cancel its contracts with the company.

Under pressure over the novelty of their capabilities, Trump earlier this month signed an executive order setting up a voluntary federal review of national security risks in advanced AI models before their release.

The White House has communicated little about how it will enforce its executive order – in which companies are understood to be participating voluntarily – and what models would fall under its review rules.

The White House recently shocked Silicon Valley by ordering Anthropic to also ban all foreign nationals from accessing its Fable 5 and Mythos 5 models, citing national security concerns.

The company swiftly shut down all access to those models, saying it could not reliably comply with the restriction on foreign nationals.

Anthropic's main rival OpenAI launched its new model on Friday, GPT-5.6, with restricted access and validated on a client-by-client basis by the US government.