OpenAI is rolling out GPT-5.6 Friday, but says it's limiting access to all three versions of the new model at the behest of the U.S. government.Why it matters: Washington is starting to treat the most advanced U.S.-developed AI models as products that need government review before they can be widely released.The big picture: The move follows similar U.S. restrictions on Anthropic's powerful Fable 5 and Mythos 5 models.Driving the news: OpenAI is releasing three versions of GPT-5.6: Sol, Terra an...