Sol, Terra, Luna: OpenAI Just Tiered the Frontier Like a SaaS Plan
By Ervin Dhima
OpenAI's GPT-5.6 didn't ship one model — it shipped three (Sol, Terra, Luna) priced in a clean 2x ladder. The real story isn't the 91.9% benchmark crown; it's that 'which model' is now a budget decision. A clear-eyed read of the tiers, the honest benchmark picture (Terra actually scores below GPT-5.5), and which tier a business should actually buy.