OpenAI Unveils GPT-5.6 With Sol, Terra, Luna Variants

OpenAI has introduced the GPT-5.6 model family, adopting a new naming convention based on capability tiers. The three variants are named Sol, Terra, and Luna.

Sol is positioned as the frontier reasoning model, designed for complex problem-solving. Terra serves as a balanced daily workhorse for general tasks, while Luna is a lightweight and affordable option for simpler applications.

The release marks a shift from previous naming schemes, emphasizing user choice based on performance and cost. OpenAI has not disclosed specific pricing or availability details for the new models.