OpenAI restricts GPT-5.6 Sol to approved users during White House cyber review

OpenAI has restricted the release of its new GPT-5.6 Sol model to approved users following a request from President Donald Trump's administration for a cybersecurity risk review. The company previewed three GPT-5.6 versions: Sol, Terra, and Luna, for a limited number of companies. While Sol is the most powerful flagship model, Terra balances efficiency and power, and Luna is optimized for speed and affordability, all incorporating stronger cyber safeguards during this government vetting process.