OpenAI has released a limited preview of its GPT-5.6 model family, including three variants named Sol, Terra, and Luna. Due to the US government's safety review framework for cutting-edge AI models, the initial release is restricted to a small group of trusted partners, with a broader public rollout planned in the coming weeks. The flagship model Sol introduces an Ultra mode that maximizes reasoning intensity and enables sub-agent collaboration. On the Terminal-Bench 2.1 command-line workflow benchmark, Sol scored 88.8% — and jumped to 91.9% when running in Ultra mode, surpassing previous records.
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