OpenAI will publicly launch its most capable model, GPT‑5.6, on Thursday, after delaying the launch last month at the US government’s request amid national security concerns that powerful ​AI systems could be misused.

This comes on the heels of the US government lifting curbs ​on Anthropic’s latest Fable and Mythos AI models last week, less than ⁠three weeks after the company was ordered to suspend their access over national security ​risks.

Washington has increased scrutiny of advanced AI model releases to identify potential threats on concerns that ​the technology could be misused by military or intelligence in China, Russia or other countries of concern.

Axios, which broke the news on the OpenAI launch, reported, citing a source familiar with the matter, that ​the US Department of Commerce had approved a broad launch of GPT-5.6, following additional government ​testing under Washington’s new oversight framework for frontier AI.

OpenAI had limited the model’s access to a small ‌group ⁠of vetted partners whose details were shared with the authorities.

The tech firm now plans to launch GPT-5.6 Sol, along with Terra and Luna models, OpenAI said in a post on X late on Tuesday.

Sol is OpenAI’s most advanced model yet, while Terra is the mid-tier lower-cost ​model and Luna ​is the most cost-efficient ⁠option.

The White House and the US Department of Commerce did not immediately respond to a Reuters request for comment outside regular business ​hours.

Increased scrutiny of AI models began with US President Donald Trump signing ​an executive ⁠order establishing a voluntary framework for AI developers to offer “covered frontier models” to the US government for up to 30 days before releasing them to trusted partners.

Anthropic has warned that it ⁠was “probably impossible” ​to make any AI model fully robust to jailbreaks ​and noted the potential for the development of a universal jailbreak that would be able to unblock “an entire class ​of harmful behaviours.”