GPT-5.6 (Sol, Terra, Luna)

OpenAI's new model family in limited preview: Sol for the hardest work, Terra for everyday tasks, and Luna for fast, low-cost work.

Three models at different price and capability points: Sol is the flagship with the strongest coding, science, and cybersecurity performance, Terra matches the older GPT-5.5 at about half the cost, and Luna is the cheapest option for high-volume work
API pricing per million tokens: Sol is 5 dollars in and 30 out, Terra is 2.50 in and 15 out, Luna is 1 in and 6 out
Adds a new max reasoning setting and an ultra mode that spins up sub-agents for complex tasks
Available to roughly 20 organizations at launch after OpenAI shared the models with the U.S. government, with general availability planned in the coming weeks

Matching model power to the job instead of paying flagship rates for everything

Reach for Sol on hard coding or research, Terra for everyday work, Luna for high-volume low-cost tasks

Developers and teams building on the OpenAI API who watch cost per task

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