OpenAI on June 26, 2026, launched a limited preview of its new "GPT-5.6" model family, announcing that it would be offered via API and Codex only to roughly 20 trusted, U.S. government-approved organizations. The lineup comprises the flagship "Sol," the balanced "Terra," and the fast, low-cost "Luna." During the preview there is no ChatGPT integration, and general availability is described as "coming weeks."
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