OpenAI previewed GPT-5.6 Sol, Terra and Luna as safety tests flagged stronger cyber capabilities and a greater risk of unauthorized agent actions.

On Friday, the company unveiled the limited preview of its new GPT 5.6 model suite: Sol, Terra, and Luna.

OpenAI introduced the GPT-5.6 family of AI models on Friday, but only limited users can access them for now thanks to the U.S. government.