White House blocks OpenAI's GPT-5.6 release, establishing de facto US AI licensing regime
Transformative AI New!The Office of the National Cyber Director and Office of Science and Technology Policy asked OpenAI to limit the rollout of GPT-5.6 as the administration builds a framework for testing and evaluating the security of new models, according to Axios.
In an internal memo reported by The Information and CNN, Sam Altman told staff the government would be approving access customer by customer during a preview period, with a general release hoped for a couple of weeks later. Altman discussed GPT-5.6 with Commerce Secretary Howard Lutnick on Wednesday, who wanted to be sure all relevant parts of the government have tested and approved the model. The decision was driven by the model's advanced cybersecurity capabilities: the government intervened because GPT-5.6 has "Mythos-like" capability, referring to Anthropic's powerful model that was pulled from public access earlier in June 2026.
On 12 June 2026, the U.S. government issued an export control directive to suspend all access to Anthropic's Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, according to Anthropic's statement and security analysis. An administration official told Axios the Commerce Department decided to take the action after another company claimed it was able to jailbreak Mythos, alarming the administration about possible national security risks. Both interventions highlight Washington's escalating concern about models with advanced vulnerability-detection capabilities that could be weaponized for cyberattacks.
OpenAI confirmed on 26 June it is releasing GPT-5.6 as a limited preview to around 20 companies, whose participation has been approved by the government, reported Axios. In a public statement, the company said "We don't believe this kind of government access process should become the long-term default. It keeps the best tools from users, developers, enterprises, cyber defenders, and global partners who need them", according to CNN. Altman told the government the current ad hoc approach is not the company's preferred long-term model.
This episode represents the clearest indication that the United States now operates an impromptu licensing system for frontier AI models, with decisions made on a case-by-case basis. There is currently no true federal regulatory framework governing the pre-release review of advanced AI models, notes Cybersecurity News. President Trump signed an AI security executive order earlier this month that directs several agencies to stand up a voluntary testing protocol for AI companies prior to releasing a new model, but the framework for implementation has not been established. In the interim, there's confusion among AI companies on who or which agency is directing AI regulation, creating an uncertain environment where the most powerful models are subject to undefined standards for what makes them safe to release.