On June 26, 2026, OpenAI announced a preview of its new GPT-5.6 model family, but at the request of the US government only a small number of approved partner organizations can use it for now, via the API and Codex. The family spans three tiers: the top-performing Sol, the balanced Terra, and the fast, low-cost Luna. Integration into ChatGPT was withheld during the preview, and general availability is expected within weeks, subject to government coordination. (previewing-gpt-5-6-sol, help center)
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