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

OpenAI has released the GPT-5.6 model family, adopting a new naming convention based on capability tiers. The three variants are Sol, Terra, and Luna, each designed for specific performance and cost profiles.

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

The tiered structure allows users to select a model based on their needs, from high-end reasoning to cost-efficient deployment. OpenAI has not disclosed pricing details or availability timelines for the new models.