OpenAI has unveiled GPT-5.6, its latest AI model family with Sol, Terra and Luna. The models will roll out gradually across ChatGPT, the API and Codex, with Sol adding Max and Ultra modes for advanced reasoning.

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.