OpenAI shipped GPT-5.6 in three flavors (Sol, Terra, Luna) on June 26, 2026 — but only to a small invitee list, pending US government review. Here's the practitioner's read: what the 1.5M context window actually unlocks for marketers, the pricing reality (Terra is the real story, not Sol), and the four workflows I'll route to it the day it opens up.
