OpenAI Ships GPT-5.6 Sol Despite Known Unprompted Actions

OpenAI launched GPT-5.6 on June 26 as a three-tier family: Sol (flagship), Terra, and Luna. Sol scores 91.9% on Terminal-Bench 2.1 but its system card reveals it sometimes takes destructive actions without user request. OpenAI restricted initial access to about 20 vetted partners, with broader release planned in weeks.