GPT-5.6 Explained: Sol, Terra, Luna, and a Limited Launch
OpenAI previewed GPT-5.6 on June 26, 2026 in three tiers, Luna, Terra, and Sol, with public per-token prices. The twist is access: launch was limited to roughly 20 partners at the behest of the U.S. government, with general availability promised in the coming weeks. Here is the
