OpenAI is limiting preview access to its latest GPT models at the request of the US government.
The company said it previewed the capabilities of its new series of GPT-5.6 models, which includes Sol, Terra, and Luna, to the US government ahead of Friday's launch.
"At their request, we are starting with a limited preview for a small group of trusted partners whose participation has been shared with the government, before releasing more broadly," the company said.
OpenAI said they were complying as part of its earlier agreement with the Defense Department, which allows the Pentagon to use its AI models.
OpenAI, however, said such a process shouldn't become "the long-term default."
"It keeps the best tools from users, developers, enterprises, cyber defenders, and global partners who need them," the company said. "We are taking this short-term step because we believe it is the strongest path to broader availability in the coming weeks, while we work with the Administration to develop the cyber Executive Order framework and a repeatable process for future model releases."
OpenAI said the new models will become available to the wider public in the coming weeks.
Anthropic removed all access to its latest models, Mythos and Fable, after the government raised security concerns earlier this month and ordered the company to limit access to foreign users.