Anthropic said on Friday (June 26, 2026) it had received authorisation from the U.S. 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 U.S. authorities due to concerns about national security.

Anthropic will continue discussions with the 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.

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 U.S. 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 President Donald 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.

Anthropic’s main rival, OpenAI, launched its new model earlier on Friday (June 26, 2026), GPT-5.6, with restricted access and validated on a client-by-client basis by the government.

OpenAI chief Sam Altman said in a post on X “this isn’t quite the process that we think is optimal.”

“I believe the government shares most of our goals, and that they are overall doing a good job in a very difficult situation,” he said.

Under pressure over the novelty of their capabilities, Mr. 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.