The US has authorized Anthropic to reinstate Mythos 5 access for reliable cybersecurity defenders.

      TL;DR: Lutnick has authorized Anthropic to redeploy Mythos 5 to select trusted cyber defenders, while Fable 5 remains limited. Discussions are ongoing.

      The US government has given Anthropic the go-ahead to restore access to Mythos 5, its leading cybersecurity model, for a specific group of trusted partners. Commerce Secretary Howard Lutnick informed Anthropic co-founder Tom Brown in a letter that the company had made “significant progress” in addressing security issues, allowing for the model’s release to “certain trusted partners.” The letter, dated Friday and obtained by Bloomberg, does not indicate any changes to the limitations placed on Fable 5, a publicly available version of the same model.

      This clearance partially resolves a dispute that emerged two weeks ago when the government imposed export controls that forced Anthropic to deactivate both Mythos 5 and Fable 5 due to concerns that security guardrails could be bypassed. Anthropic restricted global access to both models since it could not differentiate between domestic and foreign users in real time.

      Anthropic stated that Mythos 5 “can be redeployed to a small group of cybersecurity defenders and infrastructure providers” and is working to quickly restore their access. The company expressed satisfaction with the progress and is collaborating with the government to broaden Mythos 5 access and reauthorize general use of Fable 5.

      It remains uncertain what actions Anthropic has taken to address the government’s concerns regarding potential breaches. Discussions between the company and the administration are expected to continue over the weekend, with the goal of quickly restoring access to Fable 5, according to a source familiar with the situation. Anthropic is also collaborating with the government on a policy framework to manage similar situations in the future.

      The negotiations have involved senior executives from Anthropic, including co-founder Tom Brown, who have met with Lutnick and other top administration officials in recent days, as reported by Bloomberg. CEO Dario Amodei has taken a more hands-off approach in the talks, which sources say has helped ease tensions between the two parties. This approach is in contrast to his earlier direct engagement with the White House when he spoke with Chief of Staff Susie Wiles and Treasury Secretary Scott Bessent regarding the broader Mythos issue.

      The partial restoration coincides with OpenAI's decision to limit the release of its flagship model due to similar government pressure, providing a preview to partners approved individually by the administration. These developments indicate a trend where leading AI models are only available through government-managed access lists, at least initially.

      Before the shutdown, approximately 200 companies had access to Mythos via Project Glasswing, Anthropic’s invite-only cybersecurity initiative, including major firms like Apple, Google, Cisco, Nvidia, Microsoft, and JPMorgan Chase. The ongoing restriction on Fable 5 means that hundreds of millions of users who previously had access to Anthropic’s most advanced public model are still unable to use it weeks after the company confidentially filed for an IPO valuing it over $900 billion.

      Published June 27, 2026 - 9:12 am UTC