GPT-5.6

Large language model by OpenAI

GPT-5.6 is a large language model (LLM) developed by OpenAI and released on July 9, 2026. It is a family of models that comes in three distinct variants, ranked from least to most capable: Luna, Terra, and Sol. The models were designed to expand user capabilities across enterprise work, coding, scientific research, and cybersecurity.

Also known as...Generative Pre-trained Transformer 5.6
OpenAI Slashes GPT-5.6 Prices by Up to 80%

OpenAI cut the price of its GPT-5.6 Luna model by 80 percent and Terra by 20 percent after improving efficiency amid intensifying competition from Chinese AI models.