The GPT-5.6 series is launching with three models: Sol, Terra, and Luna, each offering unique capabilities and price points. Sol boasts the most robust safety stack to date, while Terra and Luna provide competitive performance at lower costs. The models have shown impressive results in coding, biology, and cybersecurity workflows, setting new state-of-the-art benchmarks. The limited preview is currently available to a small group of trusted partners, with broader availability planned for the coming weeks. Why it matters: this launch marks a significant step forward in AI capabilities, with potential applications across various industries, and raises important questions about government access and regulation in the AI landscape.