GPT-5.6 Sol Is Here: OpenAI’s New Flagship — and the Two Quieter Models That Matter More for You
OpenAI has previewed a new model family: GPT-5.6 Sol, the flagship; Terra, a balanced everyday model that undercuts GPT-5.5 by half; and Luna, its cheapest and fastest yet. Here is what genuinely changed, why the headline model is not the one most people should care about, and how to choose.