• OpenAI announces three new AI models in the GPT-5.6 series
• The flagship Sol model is accompanied by Terra and Luna
• Access is currently restricted, as per requests by the US government

OpenAI has announced new GPT-5.6 model upgrades for ChatGPT, though for now they're only available to a select group of "trusted partnerships and organizations" — a restriction requested by the US government, which OpenAI doesn't seem best pleased about.

"We don’t believe this kind of government access process should become the long-term default," explains OpenAI's announcement. "It keeps the best tools from users, developers, enterprises, cyber defenders, and global partners who need them."

There are three models in the series: Sol (the flagship), Terra (for "everyday work"), and Luna (the smallest, fastest, and cheapest of the three). OpenAI says model performance is "competitive" with GPT-5.5, with improvements in affordability, safety, agentic capabilities, coding, biology, and cybersecurity.

Sol is the best model yet for deep thinking and complex agentic work, OpenAI claims, and it apparently matches the Anthropic Mythos model for cybersecurity tasks while using a third of the output tokens.

More safety testing to come

Previewing GPT-5.6 Sol: a next-generation model from r/singularity

All three models set a new standard for safeguards and protection against "adversarial pressure" as per OpenAI's announcement. They should be resistant to attempts to disguise intent from users and to jailbreak the model.

Those who do have access to the GPT-5.6 models may come across some apparently unnecessary blocks and restrictions, OpenAI explains, as the safety and security of the AI upgrades are tested. Eventually, feedback from early testers should make these upgrades more robust, ready for a full release.

We'll hopefully get that release "in the coming weeks", OpenAI says. The US government wants to do its own testing and evaluating, and although OpenAI is complying with those requests this time, it clearly doesn't want this to be the new standard.

The mood from users left out of the loop for now seems to be one of resignation. "The days of the public getting access to these frontier models is gone," writes one Redditor, while another says "the divide has started" between the AI haves and have-nots.

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Dave is a freelance tech journalist who has been writing about gadgets, apps and the web for more than two decades. Based out of Stockport, England, on TechRadar you'll find him covering news, features and reviews, particularly for phones, tablets and wearables. Working to ensure our breaking news coverage is the best in the business over weekends, David also has bylines at Gizmodo, T3, PopSci and a few other places besides, as well as being many years editing the likes of PC Explorer and The Hardware Handbook.