GPT-5.6

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GPT-5.6 (Generative Pre-trained Transformer 5.6) is a set of large language models (LLMs) developed by OpenAI and released on July 9, 2026. It is a family of models that comes in three distinct variants, ranked from least to most capable: Luna, Terra, and Sol. The models were designed to expand user capabilities across enterprise work, coding, scientific research, and cybersecurity. Due to government restrictions levied by the Donald Trump administration, GPT-5.6 was first released as a limited preview only on June 26, 2026 for "small group of trusted partners", despite the planned public rollout in the same month. On August 10, 2026, GPT-5.6-Cyber was launched with Daybreak Blue and Red, and it solved and completed 95% of cybersecurity problems. On August 11, 2026, Astra now has "universal monitoring for risky actions and misalignment," with monitors watching over its "chain of thought" in order to stop the model if it starts to move into high risk activity.