OpenAI announced the GPT-5.6 family (Sol, Terra and Luna) in limited preview on June 26, 2026, and began broad availability across ChatGPT, Codex and the API around July 9. Rather than a single model, its defining feature is a three-tier structure that splits roles by performance, cost and speed. Sol is the flagship, Terra is a high-performance yet lower-cost option for everyday work, and Luna is the fastest and most cost-efficient, letting users pick based on task and budget. The family has also appeared on Design Arena, a benchmarking platform for frontend, design and coding.
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