OpenAI launches GPT-5.6 Sol / Terra / Luna in restricted preview

OpenAI released GPT-5.6 as a three-model family (Sol, Terra, Luna) but restricted access to trusted partners at U.S. government request, with broader access planned in weeks. Sol is positioned as flagship, beating Mythos on coding agent tasks but not crossing the Cyber Critical threshold for autonomous exploit production.

Featured · Sam Altman