OpenAI's GPT-5.6 gets staggered release after Trump administration cites national security concerns

Sol, the flagship model in the GPT-5.6 lineup, is built with a robust safety stack with guardrails against higher-risk activities, sensitive cyber requests, and repeated misuse. Terra is designed for balanced reasoning and agentic workloads, with OpenAI claiming that it offers similar performance to GPT-5.5 while being 2x cheaper.