Release2026-10-25

OpenAI released the GPT-5.6 model family. It includes Sol, Terra and Luna. Sol is the new flagship. Terra is a lower-cost option. Luna is the fastest and most cost-efficient. All three are rated High capability in cybersecurity and biological risk. None reach High in AI self-improvement. OpenAI applied tailored safeguards to each model. The system card details the safety work done before deployment.

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