OpenAI unveils GPT-5.6 Sol, Terra and Luna models — but only accessible to limited preview partners for now, per US Gov

OpenAI announced a limited preview of its GPT-5.6 model family, with Sol for complex coding and security work, Terra for business automation, and Luna for faster low-cost tasks. Access is initially restricted to roughly 20 trusted organizations after OpenAI shared its release plans with the U.S. government, with broader availability expected in the coming weeks.

The rollout shows how frontier AI releases are becoming more closely tied to government review, especially after new U.S. benchmarking and safety directives. If this pattern continues, major AI labs may increasingly use staged launches to balance competitive pressure with regulatory scrutiny.