GPT-5.6 Sol, Terra & Luna: OpenAI’s Most Powerful and Most Controversial Model Family Fully Explained
OpenAI launched gpt 5.6 on June 26, 2026, and it arrived as a family of three models: Sol, the flagship; Terra, the balanced mid-tier; and Luna, the fast and affordable option. The number identifies the generation. The celestial name marks a stable capability tier that can evolve on its own cadence. Sol ships with a … Read more