On or around June 26, 2026, OpenAI released its new "GPT-5.6" model family as a limited preview, restricting initial access to a small number of trusted partners approved by the US government. The lineup comprises the flagship "Sol," the cost-balanced "Terra," and the fast, low-cost "Luna." During the preview, the models are available only via the API and the coding tool Codex, and are not served through ChatGPT itself. General availability is expected within weeks.
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