AI TRENDS | OpenAI Releases GPT-5.6 Preview With Sol, Terra, and Luna Models

OpenAI has released a preview of its next-generation GPT-5.6 model series, including the flagship model Sol, the balanced model Terra, and the fast, low-cost model Luna. According to Odaily, GPT-5.6 introduces a new maximum reasoning effort setting and includes a “super mode” that can speed up complex tasks through sub-agents. The company said the model offers stronger agent capabilities in areas including coding, biology, and cybersecurity. OpenAI listed pricing per 1 million tokens as follows: Sol at $5 for input and $30 for output; Terra at $2.5 for input and $15 for output; and Luna at $1 for input and $6 for output. The preview is currently available in limited access to a small group of trusted partners, with a plan to open broader access in the coming weeks. The model is also scheduled to go live on Cerebras in July.