OpenAI GPT-5.6 Sol / Terra / Luna — restricted to trusted partners

OpenAI launched GPT-5.6 as a limited preview, introducing three models: Sol (flagship), Terra (balanced), and Luna (fast/cheap), at the U.S. government's request. The models reportedly beat Anthropic's Mythos on coding agent tasks but fall short on cyber capabilities. Broader access is planned in coming weeks.

Featured · Sam Altman