OpenAI rolls out GPT-5.6 preview (Sol, Terra, Luna) with tighter cyber safeguards and restricted access
OpenAI has started a limited preview of three GPT-5.6 variants—Sol, Terra, and Luna—released to a small set of companies and vetted partners as part of a U.S. government engagement. Sol is the most capable and includes strengthened cyber safety measures, while evaluations show increased vulnerability-finding power and questions about agentic behavior and dual‑use risks.