OpenAI began a limited preview of its GPT-5.6 model series, including flagship Sol, balanced Terra and lower-cost Luna, after the US government asked it to restrict initial access to a small group of trusted partners, with the participant list shared with or approved by Washington. The company said it previewed the models’ capabilities and launch plans to the US government before release and plans broader availability in the coming weeks. The limits followed US concerns about advanced AI syst...

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