OpenAI has released a preview of its GPT-5.6 series, featuring three model variants: Sol, Terra, and Luna. Due to the US government's security review framework for frontier AI models, the company initially limited access to a handful of trusted partners, with a broader public rollout planned in the coming weeks.
The flagship model, Sol, introduces an Ultra mode that cranks up reasoning intensity and enables sub-agent collaboration. In Terminal-Bench 2.1, a command-line workflow benchmark, Sol scored 88.8% — and jumped to 91.9% in Ultra mode, beating...