OpenAI unveiled GPT-5.6 on June 26, 2026 — a limited preview of Sol (flagship), Terra (medium-tier), and Luna (fast/affordable). The release follows reports that the Trump administration asked OpenAI to stagger the launch while federal agencies evaluate the models under the June 2 cyber executive order framework.
OpenAI confirmed it previewed plans with the U.S. government and is starting with a limited preview for trusted partners whose participation is shared with authorities. The company stated it does not believe government gatekeeping should become the long-term default but is taking the step to reach broader availability in coming weeks.
GPT-5.6 is especially skilled at coding, cybersecurity, and biology, with safeguards that may occasionally intervene on legitimate dual-use work during the preview period. Trump administration officials will approve customers on a case-by-case basis during preview.