OpenAI shipped GPT-5.6 on June 26 — not one model but three. Sol is the flagship, OpenAI’s most capable model yet. Terra is the mid-tier workhorse. Luna is the cheap, fast one. Same day, GPT-4.5 quietly vanished from ChatGPT.
The catch: you can’t have it. OpenAI handed the models to the U.S. government first and limited the initial preview to roughly 20 organizations. General release is “coming weeks” — no date.
What each tier is for
Sol takes the hard stuff: complex coding, biology, and what OpenAI calls its strongest cybersecurity model to date. Terra handles high-volume work like support and document analysis. Luna does summarizing, drafting, routine automation.
The API angle
All three are API models, priced per million tokens — Sol at $5/$30, Terra $2.50/$15, Luna $1/$6. New here: a “max” reasoning effort and an “ultra” mode that spins up sub-agents for harder tasks. For now, only trusted partners get keys.
This is OpenAI’s answer to Anthropic’s Mythos and Google’s Gemini 3.5 Pro. The gated launch is the real story — capability is outrunning access.
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