OpenAI Clears US Review and Pushes GPT-5.6 Family Worldwide, Yet Withholds Capability Data

The Sol, Terra, and Luna tiers exit a restricted preview and reach global users after administration approval, but measured performance remains undisclosed.

OpenAI has placed its GPT-5.6 model family on the open market after two weeks of limited access granted only to government-approved partners. The three-tier lineup, Sol at the top, Terra in the middle, and Luna below, now runs inside ChatGPT and the rebranded ChatGPT Codex product for any user with an account.

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