STORY: OpenAI will publicly launch its most capable model, GPT-5.6, on Thursday.

Its launch last month was delayed on the U.S. government's request over national security concerns that powerful AI systems could be misused.

It was a similar story for Anthropic; Washington last week lifted curbs on its latest Fable and Mythos AI models.

But this green light came 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.

There are fears the technology could be misused by military or intelligence in China, Russia or other countries of concern.

Axios reported, citing a source, that the government had approved a broad launch of GPT-5.6, following additional testing by Washington. 

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

The tech firm said it now plans to launch GPT-5.6 Sol, its most advanced model yet, along with Terra and Luna models. 

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