OpenAI has officially launched its new GPT-5.6 family of models for general availability. The lineup is led by its new flagship model, GPT-5.6 Sol, alongside Terra for everyday workflows and Luna, the company's most cost-efficient model.
GPT-5.6 Sol sets a new standard for intelligence and efficiency, delivering advanced performance across coding, knowledge work, and science at a lower cost per token. OpenAI claims Sol outperforms competing frontier models while utilizing fewer resources.
The update introduces "ultra," a high-capability setting that coordinates multiple parallel agents to accelerate complex tasks, and "Programmatic Tool Calling" to optimize API workflows. Additionally, GPT-5.6 brings improvements in design judgment, enabling the AI to build and visually inspect functional frontend interfaces. The models are equipped with OpenAI's most robust safety upgrades to date.
OpenAI GPT‑5.6 family
https://openai.com/index/gpt-5-6/